There is not any hint and i consider it very unlikely. Did Konami actually ever make something DRM free on the big platform, which is not on GOG?
https://www.pcgamingwiki.com/wiki/Silent_Hill_2bazilisek: FAQ: Q: But Steam is DRM! A: That's not a question. And it isn't technically true. Steam's DRM solution (called "CEG" by Valve) is just one of many Steamworks components game developers may use, alongside achievements, cloud saving, the workshop, matchmaking network code etc.; just like with all the others, implementing it is not required to distribute a game on Steam. A game can use the other Steamworks features and still remain DRM-free.
Q: How do you determine if a game is DRM-free on Steam? A: Simple: install the game and launch it once (this step is important, because this finalises the installation). Shut down Steam and temporarily move all the files in the root Steam folder somewhere else. Locate game folder, locate the .exe, run it. Either you get an error message (or it does nothing at all), or the game just runs. If it just runs, it is DRM-free.
Q: Game X has a source port which makes it effectively DRM-free. A: True, but that isn't quite what this list is about. Obviously if you don't use the game executable at all, you are bypassing the CEG ("Custom Executable Generation") component completely. The idea is to determine whether the CEG component is actually present and active, which is something not advertised by Valve at all.
If it can not run without the account, in this case "account bound", it is a DRM, out of question. It does not matter how those "locked demands" are called. Obviously a game need a OS and hardware in order to run, but anything above this is in most cases (except online only games) unnecessary.
There might be ways "circumventing" it but those methods may become so "deep" (cracked exe for example) that it is almost same as getting a pirated version (which is basically removing the whole idea of getting it legally). Some games may work with emulators and what else but this is already "advanced knowledge" 99% of users may not bother or are not capable to deal with and there is no "easy workaround". Simply to state some blunt matters, not creating a bright blue sky here... a DRM is simply a DRM, no matter how it is done.
Indeed... there are a lot of DRM free games around but most of it is rather crap... stuff most users might not get, no matter its shape. The truly good stuff is around 1-2 dozens (almost for any taste, unless someone is a "hardcore indie lover", they may get hundreds), not much more. For most of us it can enrich the usual DRM free collection but thats it.
As for how DRM free games, no matter GOG, Steam, EGS works: If someone is not using the requested interface (in most cases in order to allow online functionalities) because the required executables are NOT installed, a DRM free game may still run but in a "non online mode", so basically fully offline. It does not mean it can not work online, instead even being able even to run "offline only".