When you are resorting to arguments that begin “he won the league despite….” there isn’t a really a lot to respond to.
He won the league. There is no despite. He won the league.
I think he did magnificently to steer the club to an unexpected league title in his first season. It’s no more than anyone had any right to expect.
I’ve never understood the idea than having won the league, then that achievement is safe while we then unpick all the decisions that led to it.
Slot won the league. Had he played Chiesa (a player who outside ten minute cameos looks frankly poor), then he might not have.