[Matrixbeast]

It's because of his overall mentality towards the series.
He treats it as a side project to do for fun, with a much reduced priority compared to Atop the 4th Wall, but he just doesn't realize that, just maybe, when he has literal legions of people asking for the next History, that some people really like the series and don't want to see it shoved aside for another drawn out and convoluted AT4W story line.

It's just like his first Top 15 Screw Ups video. He puts more effort into defending himself and his actions rather than owning up and accepting that he was the one to blame, not everyone else around him.
And that's my overall assessment of Linkara. It always feels like he's saying "I'm not the one making a mistake. I'm just forced to work after someone else screwed up first."