"if he had no other choice, having said what he said would be a brave act in
itself. So, I don't think it was a joke"
Knowing how Linus is a person not afraid to say what he really thinks (and,
to even "give the finger" to entities he doesn't like), I know him not to be
a coward. So, that's why I suspect him to be brave enough to do something
like this... ;)
And, knowing (from being well informed) how the establishment always tries to
recruit the best minds for its side, and also make them "change sides", once
they become prominent, only adds to such suspicion.