I imagine the usual multiplier number is somewhere around 99 a lot of the time, just because I have a really hard time thinking more than 50 people show up for Nick's unannounced 5k viewer streams, maybe lowered to 50 or 10 on his more regular shows, just based on how many actual viewers similar YouTube channels get (maybe a few hundred at most).
I think the best autismo test would be to copy PPP and Warski's op of opening a hundred tabs (on various computers), noting the viewer numbers, closing them all at once, and checking the difference and dividing that by a hundred. Though it seems like they can adjust the multiplier on the fly, so I don't know what the point would actually be anyway.