Well, there’s at least two aspects here:

Fucking Thor, PirateSoftware.

Up untill Ross posted his ‘SKG is dead’ video… Thor had by far gotten the most views of anyone with a video discussing SKG.

And Thor… well, he was anti-SKG, and had been spreading a bunch of objectively false bullshit about it, actual FUDD.

So… about half of Ross’s video was dedicated to pointing out how Thor was wildly misunderstanding things, and fairly graciously and politely trying to correct these misconceptions.

So here’s the two sort of things at play I see, in terms of 'why sudden surge now?'

1. Thor was just shown to be objectively, factually wrong. Thus, the immediate effect of this would be to reiterate and clarify and reinforce with more specificity what SKG actually is… and that could directly convince people to give a damn.

But uh, almost certainly much, much more relevant

2. Ross doing (1) created an absolute drama shit storm via the way youtube works now… which is very much just drama mongers and commentators reporting on e-drama. (1) kicked off an actual, honest to god, truly viral explosion of many, many people who’d basically never heard of any of this before, most dogpiling on Thor for being such a disingenuous, egotistical asshole and liar.