Short answer: no.
That said, there is not - and probably never will be - anything like a consensus on who the greatest manager/coach of all time is.
Less so, even, than for players (and there is no consensus there either).
But there are several managers/coaches you could make a better case for than Pep, based on relevant criteria - so why should it be him?
He's obviously there or there abouts in a wider sense (it would be ridiculous to pretend otherwise, as in: he's actually a "fraud"), but if you compare it to the discussion about where Messi belongs in an all-time context (see above), it's (much) less clear.
Or, if you will, there are (far) more candidates who could be placed above Pep (based on relevant criteria) than is the case with Messi.