You had me scared with this one, but it was nothing after all. I thought he would wind up arrested or something like that.
LamazeP is incredibly prolific, some other notable contributions include "Triple Baka" and "Ai No Uta." He differs from many other producers in that he makes a lot of hit music and internet culture but does not act as an accessible producer or do stage appearances. For all the cash he'd make given his content, he's the quintessential internet weirdo. More on that a bit further down.
By no means is the idea of LamazeP being a lolicon "new," or is this the first song he's written on the subject. "I Want You" is almost as explicit. A more accurate translation of the description video quoted is that he decided to go "full lolicon," and in doing so got pure moe beamed into his head, as if to explain why the song's theming is more cute than his average song- not to say he's converted into one from not.
I'm not sure what people are expecting with Japan, but that's Tumblr for you. These are the same people still trying to come to terms with Lovecraft being a blatant racist in the current year and some change, even though he's long dead. Trying to protect LamazeP's legacy, like the idea he's just become a lolicon or able to cater to lolicons is new, it's adorably naïve.
By definition, people interested in Vocaloid are at least Otaku in some related interest, and many early Vocaloid producers (him included) are thoroughly rooted in denpa and moe culture, these are
weird people, not normal Japanese musicians. If the music alone wasn't enough to tip you off, I mean. Liking the lolis in Japan is about as rare as being gay is everywhere else, and they have loli mags on some convenience store racks. I don't think I need to explain that the rest of the population has pretty strong feelings on this subject overall, not the ones you'd expect, or that Otaku are vastly overrepresented in that 4 to 13%. This is the arena you step into when you intrude on weird people's hobbies, and make no mistake, Vocaloid is in that camp, even if many in the West don't realize that's what they're doing.
While that tumblr post ruminates on LamazeP outing himself as a pedophile, the complete opposite spin is in play in Japan. There's a great deal of support for banning Lolicon and hentai in general over there, not mainly because of the content itself, but because they believe people who wank too much
won't have sex- at all. Strictly the opposite concern, closer to the "nofap" shenanigans; far from fearing some illusory child rape production line, they're more concerned with declining birthrates and women being outcompeted by fantasies. In other words, most there don't view twisted Otaku as pedophiles so much as
celibate, like hermits.
Cultural humility is important. It's better to simply reject Otaku culture outright ("fucking Japan and their weird nuke shit" is a valid position), rather than to try and pick and choose which bits you prefer. Conversely, you can as easily enjoy something without any effort to care about the identities and character of the people who created it, or to try and hurt those people when they fall outside the fraction you find to be acceptable.
I'm kind of surprised HachiP or Kikuo aren't in here anywhere, their songs are nuts. I suppose the art and the artist aren't so closely related after all.
Edit:
Is Vocaloid even that big anymore? I feel like it was a more 2010s thing. It seems like most of the big name producers have largely moved on and now it's just a bunch of smaller people doing their own thing from what I can tell.
It's had a few new artists ascend into big name status as new producers or from relative obscurity (the aforementioned GHOST and Creep-P, both embroiled in controversy), and remains culturally relevant in Japan, but the fad in the US and Europe has died to a dull roar outside of these cases. Which makes it cow breeding grounds, naturally. Not unlike Otaku in Japan that this is splintered off of, an even smaller community is born, and it's way easier for the West's brand of trendy internet outcasts (in this case trannies and Tumblr trogs) to make a big splash if the pond is smaller than their morbid BSA.
Edit Edit:
I had the thought that maybe particularly strange people are endemic to communities that have lost popularity. Small communities are too small to catch the crazies, but big communities that become small communities again do retain the hobbyists, now infested with the people crazy enough to stick around despite only having a social interest in the content (or because they have an unhealthy obsession with it).