I wish they'd just be honest in saying that they don't speak 93.3 languages fluently. It's impressive enough to be able to recite basic speeches or improvise without adding the false claim of speaking them like a mother tongue. I think this guy is awesome, but his Hebrew is legit not great and the mispronunciation of a very, very, very common and simple word in "musag" proves that his Hebrew isn't anywhere near as good as he says it is.
Eh, I didn't feel as strongly about the exaggeration of his Hebrew skills as you.
It seems to me his comment on Hebrew feeling like a second mother tongue was probably motivated by his personal Jewish background and meant to convey his regular and long contact with it rather than his proficiency (he after all begins the video stating French is his most proficient language after English).
He does try to give an impression of spontaneity to what is obviously rehearsed speech, but I don't see him making any boasts anywhere else in the video, so I'd cut him some slack, especially if he prepared all the text himself without having any native go over it beforehand (as the mistakes make clear is the case)
Anyway, his accent is quite impressive and his voice sounds so familiar, but I can't remember for the life of me on what cartoon I heard this voice before, even though I have been on the lookout ever since I've watched this video for the first time.