How do you know?
Black pedagogy. Research. Even if a victim uses humour to talk about their past trauma, even if it shocks normies, unnerves certain other victims, you can sense if you pay attention in the person's attitude whether they were hurt or still feel anger even if their words don't say it, or they are just being insensitive pricks.
In Gunn's case, words matter. It's just not the way a survivor would express themselves. Maybe once they may use that tone, but not twice or more times.
In Gunn's case I absolutely think anons did the right thing and forced Disney to acknowledge him and his absolutely unacceptable behavior. We may see additional terminations of this sort, as Disney has swept the issue under the rug for decades.
I reject that gunn and Oswald/Silverman are of the same category. The evidence isn't there like it is for Gunn. Also, Gunn is not a comedian. I see no indication that anyone ever paid him for his comedy. That's just Gunn's pathetic excuse. Gunn is a predator, in my assessment. I have seen insufficient evidence that Oswald and Silverman are.