You don't also mention Slot's main factor to help him in winning the league is Klopp's legacy. I don't think he could do that without having a full arranged squad as Klopp's legacy. He coached a club that has connection, chemistry, and team work. It makes his burden became smaller, than any other new coach who have terrible squad to start.
That's they reason i think he get some lucks this season, but can't deny the fact if he's doing bad, his club also doing it tho. He deserves a lot of applause, though he came from low tier league.
But that is not always a benchmark because usually the change of coach can also provide something worse even though in the case of slots it might be excluded because it has a solid squad that has been built previously by Jurgen Klopp. Apart from the achievements obtained by the slot but I believe he has the quality in handling the team and maybe next season can be a reference for how he is able to maintain the existence of the club.
Luck is inseparable from the good achievements obtained by the slot but his hard work should also be given appreciation because so far he has been able to make a significant difference so that he managed to get the 20th English League trophy.
In fact, Klopp's squad legacy has been so dynamic. it can adapt even to the new game plan that came from a coach who have never coached a big team before. This showed how good the squad is. I know so well how coach's performance impacted the club a lot, but the result totally determined by the players.