> And who, if I may ask, is this person

"This person" is Thomas Bushnell. https://en.wikipedia.org/wiki/Thomas_Bushnell

> who is so eagerly ventilating his opinions to feed the wolves? To me it sounds more like he's upset

This is just my reading, but "A reflection on the departure of RMS" does not have the tone of someone who is upset nor someone who is eager. It has the tone of someone who feels like they have a unique perspective that ought to be shared on a difficult subject.