I'm split on your comment.
On one side, you indeed quote Stallman itself and the source of the quote. On the other side the complete quote reads:
The term is applied to a broad range of actions, ranging from stealing a kiss to rape, as well as other things in between. It acts as propaganda for treating them the same.
There seems to be an exception for TSA agents, however.
The term is further stretched to include sexual harassment, which is not a specific act, but rather a pattern of acts that amounts to a form of gender bias. Gender bias is rightly prohibited in certain situations for the sake of equal opportunity.
I don't think that rape should be treated like stealing a kiss, so I reject the term "sexual assault" completely.
Reading the full context and your except was totally different for me. The full context, implies he doesn't accept the term, because it's an umbrella term that does more harm, than good. That's arguable, but doesn't seem a radical opinion.
In fact, IMO, I agree that using "sexual assault" for something other than rape / attempt of, is depreciating the full meaning of the term and victims are normally the first ones to be affected by it.
I do agree that other crimes, born from gender inequality, are very serious as well - that doesn't mean, we should bundle them up. How would society react, if slaps started to be prosecuted as attempted murders?