I agree that there is fundamentally an irrational / subjective / emotional core to meaning. And I even agree that the more passion one has about something, the less does rationality tend to play a role. So in a way irrationality is meaning, not rationality. However, I say tend to play a role, because I see no reason to assume that passion can not also manifest in a rational. I may have this and that urge / instinct, but when it comes to such passion to manifest itself in actual action and decision, rationality can help such manifestation. Through reflection. Rationality helps to interpret the world and without interpretation passion can not manifest itself into decisions.
And funnily enough, I think the philosopher whose opinion was presented is prove of that. You can not just jump from passion to action unless you are a mindless animal. But such an animal wouldn't be about to devout itself to a religion.
He has the passion to devout himself to his religion. This passion may fundamentally be irrational and hence "true" with regards to meaning, but that this passion actually manifests into a devotion to his religion required interpretation. In this helped by the
rational that this was "true" and hence worth it because it was his passion.
So while on the hand it is a valid point that meaning is irrational, on the other hand in the extreme sense this is portrayed in the video it also creates a false dichotomy. Passion may be the start of it all. Rationality may weaken passion and hence meaning. But because passion without reflection is nothing but animal instinct - rationality has its place in finding meaning.