Seems like there are quite a few people that are still upset by the trade - so, sort of seems like an accurate post? Unless some Rams fans wouldn't be happy if the Rams won the Super Bowl, which I doubt.
If you look up what an apologist is (someone who offers an argument in defense of something controversial), calling posters who defend(ed) Goff are Goff apologists, by definition.
And it was in a thread about Stafford where many have discussed both Goff and Stafford, so it was relevant to the topic too.
FWIW, I've always been a Troy Hill apologist, so I've never found that term/phrase offensive.