Earlier quoted context omitted.
You are falling for a classic argumentative attack. Everyone agrees "abuse" (e.g. beating your wife) is bad, so Fisk just redefines "abuse" to mean "earnest, blunt, non-sugar-coated feedback" but you keep on using the connotations of the real definition.
Where can I find the redefinition?
It's a rhetorical device that relies on readers being fooled into the equivalence of what practice the sophist wants to go away and some form of harm. There's no equivalence, though. It's just rhetoric to obscure their actual argument that's probably indefensible or just weaker to rational people. The author of the counterpoint shows that nicely by illustrating what the actual critiques were with evidence, showing the author that was griping had a personal stake in that evidence not coming out, and was just using sophistry to preserve preferred status quo and her career.
Do you understand the technique now? I can provide more links to disinformation tactics in general or the ones preferred by manufactured-harm subset commonly called SJW's if you need.