I can believe that that's true currently, but it would not be hard for DPC to set something up so that editing variables (via console or save edit) sets up a time bomb that he can detonate in any future release.
It's pretty rare for AVN devs to use anti cheat measures. In DPC's case he already has a soft check like that and chose to just poke the player a little. Jacob basically calls the player out if you cheat the mansion minigame. If there's any check it'll be like that I'd think, poking fun versus borking a player's save.
DPC has zero reason to outright punish cheaters. Most devs don't outside multiplayer or microtransaction driven games. Cheaters aren't stealing your code, aren't changing your work, what they're doing only affects them and it doesn't tend to create a swarm of dum-dums asking why their modded save doesn't work...after you know an update because if you use the console or URM and something breaks you know your chimp ass likely caused it. Using them for replays is common as well, and people invested enough to play more than once are the last people devs want to go after. Whacking them on the nose just risks making them go play something else and never give you another cent. Which is probably why he doesn't give much of a fuck and just had a bit of fun with the Jacob reaction. Cheating just isn't a big enough deal for most devs to care about in a single player game to the extent of creating a time bomb over it.
There's no motivation for him to do it and judging from past behaviour he'll have fun with it instead of punishing the player.