Absolutely no truth in that. Patches are 100% safe unless they are ones that let you get stuff you should be able to (eg: wild legendaries in random areas on Pokemon). If it's just text or audio, patches are completely undetectable and even others like Pokemon ROMhacks are still safe unless you use something illegal in online multiplayer (and even then it's not always a ban).
Only things you should care about when it comes to bans is outright cheating in competitive games (eg: MK7) where you risk a game-specific ban and playing leaked games prior to official release online which can get you a LFCS ban (recoverable though so don't worry). Unless you cheat online a LOT or play leaked games, never bother wondering, it's safe.