We are told to listen to the teachings, then contemplate them. In contemplating a teaching you endeavour to more fully understand what it means. I think it deserves further examination.
IMO this one is pretty cut and dried.
Ok, so then what is "Buddha Activity" ?
I don't remember exactly, read the Uttaratantra, one of the Tathgatagarbha sutras or something, lol. Basically the idea is that what benefits beings arises spontaneously and leads beings to fruition, for the purpose of this conversation. Beyond that I don't remember the specific presentations, to be honest. The idea is, this can't happen with the knowledge obscurations in place that come from merely dwelling in Nrivana, so simply abiding in liberation makes this kind of Buddha activity not possible.
As I understand it, that is the gist of what HHST is saying.
"it must be coming from the mouthy mastermind of raunchy rapper, Johnny Dangerous”