They've been beating defenses with 2 high safeties for years. You are right in the problem earlier this season being that Mahomes got stuck on trying to make the big play instead of taking what was there initially and he got back to doing to much of that the other day. IMO that wasn't his big issue against the Bucs.
Teams weren’t playing 2 high safety the whole game like they started doing after they saw what the Bucs did with it in the SuperBowl. The first 7-8 games of the season Mahomes and the Chiefs looked exactly like they did in that SuperBowl, at one point they were 3-4, Mahomes was leading the league in interceptions and his team was leading the league in turnovers, all this with a whole new offensive line. People were trying to blame the defense and the receivers but if the offense is turning the ball over like that then of course teams are going to score and make the defense look like they are the problem, Mahomes was running around crazy and just like in the SuperBowl those passes weren’t being caught by the receivers.