The most baffling thing about this Enigma DRM being added Resident Evil: Revelations is that the game is over 10 years old now, so anyone who wanted to pirate the game has already taken the steps to do so. For extra irony, consider that the addition of this DRM may have only encouraged people to pirate an earlier version of RR:Rev if they hadn't already.
To explain why this update is including a DLC patch: The "Jill's Samurai Edge + Custom Part 'S.T.A.R.S.' DLC" was inexplicably broken since a patch back in June 2021 and could only be usable by players if they disabled two other weapon DLCs (Jessica's and Parker's) prior to booting the game. Multiple reviews on this DLC's store page on Steam mention this problem, but I also personally experienced this and can verify both the issue and the fix at the time.
So yeah, it's nice that both this DLC that has been broken for years has finally been patched and that this Enigma DRM has been removed from Resident Evil: Revelations, but there's no real reason that this DRM should have ever been added to a game this old and still playable in the first place.