I have seen several real historians say the same thing. I'm not a historian myself, but when I see professors of history in various institutions saying something, I tend to suspect they actually have a consensus, although as others pointed out, maybe it's not a consensus and I would have no way of knowing.

I'm not doubting the library existed and it was destroyed possibly burned more than once but the common trope that Christians did it does not seem to be backed up by history.