I hate to talk about stuff like this. As it is often seen as such an excuse, but there is a slight edge for KC in both calls and luck. KC seems to get more free plays than any team in the NFL, when others teams are called dead. Also they do have a lot of opportune penalties, but some of that is just good teams forcing mistakes. One thing that is interesting is how lucky they are. KC is shown through various metrics as having been one of the luckiest teams if not the luckiest recorded stretch in NFL history in the past 5-6 years since these things have been closely recorded (so really the past 15 or so i think).
Also health wise they've been fairly lucky with their star players. Doesn't mean they haven't been the best team in the NFL in that stretch, and don't deserve to be considered dynasty caliber, but just look at this year alone. 13-1 with a fairly paper thin point differential for such a record, and the fact the ball has bounced their way along with key plays has kind of been par for the course for them during this run. Not trying to take anything away from them. But since the first 3 really dominate Mahomes years, the last 3 haven't seen the fall off we would expect.