There is no evidence of this. This is a Citogenesis fiction pushed by niche media. Making videos criticizing someone's videos isn't harassment. Patreon did an investigation just after the incident. My understanding was there was nothing. If there's evidence of him doing anything, it is actually of him attempting the "harassment" (really just insulting) white supremacists using toxic language.

then shows up in the front row at her panel. That is not an innocent act.

If there is no harassment of Ms. Saarkesian, that is an innocent act.

Note the pattern here. There is simple, straightforward evidence of people just sitting there while a speaker hurls abuse over the PA system. To explain this away, a narrative is needed, which includes some sort of conspiracy theory. Immediately following the incident, Patreon found nothing. Just prior to that, the GamerGate movement was investigated by law enforcement, and they also found nothing.

Just take the facts at face value. Occam's Razor. The simplest explanation is that mainstream media takes the narrative from biased niche media and does not fact check. Please notice that the evidence on your side is all weak "guilt by association" and easy to fabricate narratives.