Auto-translated
There is a way to counter these "tricks." Introduce a rule for tournament games: only the beginning of a turn can be loaded, not an autosave.
Regarding replays. There doesn't seem to be anything wrong with using them; it seems that if a lot of time has passed, why not watch them? But there is one point. One player will watch replays and remember during bonus time, while another will do the same on their own turn. In a time crunch, this can be critical. Therefore, let everyone be on equal footing.
As for tracking, there are many things in Heroes that cannot be tracked, but everything secret will eventually become apparent, and if a player is willing to go for such a minor violation, let it remain on their conscience, but if it is discovered somehow, let them not be offended later.