So there's a reason the NFL is classified as an entertainment league instead of a sports league, so they can kind of throw their hands up in the air at this stuff.
Let me preface this by saying the Bills had a chance to drive down and win the game, so I'm not necessarily saying there was any shenanigans at play in this game, but here is how I think it truly works in the NFL. The players and coaches go out there and are legitimately trying to win the games, there is no "script" so to speak with that part of the game. What I do think happens is the NFL tells the officials in a round about way, in certain situations to give certain teams, not necessarily the Chiefs, a better chance to win. Maybe Fan Duel takes a bet where if said bet were to not pay out they would make untold millions of dollars. They let the NFL know about this, so the officials will call the game a certain way (It's not a guarantee, but it tips the odds in Fan Duels favor and over the course of a season and millions of bets they make a shit ton of money) . I'm very certain this happens in the regular season. Whether or not it happens in the playoffs, I have no idea.
The worse things to happen to the integrity of the NFL was for them to get in bed with all these gambling companies. I think eventually things will come to light. It may take a 10-15 years, but someone will slip eventually.