Basically everything has gone against both City and Arsenal this season and everything has gone for Liverpool. It is what it is.
I think Slot deserves a huge amount of credit but IMO they are not at the level of Klopp's top sides, they are just a very good side that has kept almost its entire contingent of field players reasonably healthy while catching a bunch of other breaks. They caught Arsenal without Odegaard or Saliba and were still outplayed until Gabriel got sent off, caught City at their absolute nadir and of course with huge injury issues, caught Spurs missing four of their starting back five, Chelsea was also missing two of their starting backline against them, the match at Goodison came at a point when Everton was hitting some form and would have been very tough under the weather conditions but it got postponed, etc.
You still have to win the games and they are doing it in style so I would not put any asterisks next to a title. But its a reminder that in normal times (ie, without Pep's peak City around setting crazy standards) winning the title is mainly about being one of the 2-3 best sides on paper and then just having the best luck among that group in terms of keeping your side healthy and catching other breaks over the course of the season.