His entire logic on that is "If they're in high school, it's loli because they're teenagers" and "the main character looks like a teen". Which he then tries to justify by saying "If they're 18 or 19" or some shit, apparently forgetting... that's legal. I could go on and on again about the whole issue with visual age in anime designs, but the short version is that it's an informed attribute for the most part. Now, as noted from a brief google, the apparent subject of the dicking is specifically his older cousin. Another quick search will bring up the episodes, which in the first 30 seconds, introduces the main character as a third year high schooler, which means he's justifiably 18. This also isn't just subtitles pulling shit, he's introduced as a 'koukou sannen', which is definitively thir dyear high school. There's two other characters depicted in the first minute or two, one of which is a girl the MC's age (so also 18), and his older cousin. That's it. The whole depicted cast is 18+. From a quick clickthrough, it's just 18yo MC fucking his older cousin and a one-off scene of the other girl pissing because gotta get them fetishes in somehow.
Here's the thing though, from the clips that he used (highly censored) in the video, it seems like a completely different show he's talking about reacting to, so 1) he can't get his information right 2) he hasn't fact checked it at all. I'm going to go out on a limb and just say that the later diatribe he goes on after being chastised for not fact checking shit is literally self-demonstrating idiocy on his part proving that his attempt to set the record straight is just him lying through his teeth, again having not fact checked anything and is just in pure defense mode trying to smokescreen saying "I'm not a pedo guys!" over... what exactly? It seems a lot more like people were just calling him a diddler based on whatever ambush tactic Nux pulled in the past to get him to watch some loli stuff (or presumed loli stuff, who fucking knows because he sure doesn't) and is now throwing Nux under the bus to save his own ass. The number of times he says "I should have known better and never done that" is some peak bullshit he's busting out now long after the fact to try to exonerate himself of some perceived wrongdoing, as much as a staunch antiloli crusader he paints himself as he sure had no fucking problem sitting there and looking at whatever this offending media was the first time despite his absolute disgust for it. It's only a problem now because presumably he's catching heat for it and wants to save himself. Shame all his body language reads like he's just trying to make you believe him as he's spinning this tale of falsities and imagination.
He's actually just using the word 'loli' as a weapon to make a stand to place himself as a staunch enemy of loli even though his example certainly doesn't actually qualify even with his braindead attempt to shoehorn age of legal majority by specifically trying to lump 18 and 19 in with loli. Mostly unrelated too but later in the video when he's talking about how he doesn't watch stuff like decapitation/gore videos from mexican cartels for fun, he also fakes a gagging vomit to try to get a point across and give credence to how much it bothers him, completely brushing over the fact that he doesn't have to watch them, he's still making the choice to even though they supposedly elicit a near-vomit reaction from him to do so.
I'm also a fan of how he shows a big message in a moderation queue from his subreddit that is autopurging messages criticising him, acts like "Oh shucks it's all that automod's fault we'll change those settings one day!" and reinstating a filtered comment in an apparent show of agreement. As if he didn't specifically tool the automod to delete those things in the first place. I almost considered going to see if that comment was actually restored and not just deleted again when he was done with it for the bit he was doing but I'm not scrolling that fucker's reddit of all places.
tl;dr What a retarded Yamanbafaggot lying about this shit. I hope he burns down anyway.