@Strix454 you seem to have the best command of the facts. How wide was the release of the film in question? I think that's going to matter for what we're discussing. The level of release the film got before it was pulled will essentially be somewhere from "major theatrical release" to "posted on Monty's website for a week and five people saw it", and at some point I don't think you can unring the bell and demand nobody make fun of you for your private copyright that you previously publicly broadcast to everyone. Like I know it wasn't popular, but that doesn't mean he didn't try and make it that way.
As far as I've been able to determine, it was "released" on Youtube in 2010. I don't think there is a trustworthy source for how long it was on youtube. There were stills taken from the video at some point and used by people to talk about the film and clips of undetermined origin with different edits & lengths sometimes appeared in different places. But there is no clear evidence that Monty himself has distributed "the umbrella man" since youtube in 2010. I would think that video would have been taken down on YT for obvious TOS violations in 2010, but I have no evidence of that happening.
When Jake Morphonios wrote his response to Monty's lawsuit against him in 2019, he was able to come up with three mentions of the film as a public controversy all dating from the 2015-2016 timeframe. Nick's attorney wasn't able to do much better so far.
I looked at the response from the guy Monty sued in Colorado from 2019 and looked at the websites he's cited as evidence. It goes without saying that all of these appear to be written by random boomer conspiracy theorists.
TLDR: I don't see how you can determine the reach of the video while distributed by Monty accurately without proceeding to discovery and deposing him and/or trying to subpoena YouTube in the hopes that they keep data on 7+ year old deleted videos.
The first article the defendant cites is a blog post from July 2015. In this blog post it is stated that: "In 2010 Montagraph released a video on YouTube called “The Umbrella Man.” The video was removed almost immediately by the YouTube Community Moderators, but was later reposted." In this blog post it is mentioned that people have speculated the video is real but adds "we have no evidence to suggest that this is the case." The blog post describes the actress as a "young woman" and not a child.
A second blog post from November 2016 appears to be the earliest extant source which claims that the video is of a child. This blog post is from the guy who thinks that "The Firm" wants to wipe his brain, and in fact the very same blog post was cited by Randazza in footnote 7 of his reply to Schneider's opposition to the motion to dismiss. What is odd is that the post includes a screenshot which if real shows the video still being up around the time of the blog post on Montagraph's channel with 3,479 views at the time. The screenshot shows YouTube's logo as including a hashtag "#VoteIRL" which would date the screenshot to around the time of the 2016 elections. The purported screenshot is cropped in such a way that the date of upload is not visible.
The defendant cites a third weirdo's blog post dated December 2016 which speculates that the actress from the video is a certain adult female who they specify by name and who has relevance to their insane conspiracy theories. Bizarrely, this very lengthy post appears to have been translated into Chinese and is still available circulated on various Chinese-language conspiracy websites.
It is unclear IMO the periods for which the video was uploaded on Montagraph's channel. One blog post gives a date of 2010 and states the video was removed for violating TOS, the IMDB page gives a date of 2014, and a 2016 blog post has a screenshot which if real shows it was uploaded on Montagraph's channel in 2016. It's clear that by 2019, when Rekieta learned about the guy, the complete video had been totally scrubbed off the Internet and only resurfaced later.
It does appear that the oldest extant evidence of an accusation of the video potentially featuring a child is from this guy who fears brain wiping. The only extant evidence I can find that the video was being distributed by Montagraph past 2010 comes from the same guy. From what I can gather, the main controversy over the video was that some conspiracy theorists in the mid-2010s believed that the video contained a checkerboard pattern or something which was a winking reference to the Ramsey murder case in Colorado, suggestive of Monty's involvement in the crime, which is both insane and not something Rekieta brought up.