Have they stated that they're going to support Linux or at least Proton/Wine? I did a quick search on the game's Steam forum and it sounded like it doesn't work currently.
It sounds like they're using Anti-Cheat Expert, which is some Chinese AC. It doesn't support Linux and there isn't an existing wine module to support it, like there is for Battle Eye and EAC. So no, it won't work at least for the moment.
I’d recommend removing it from your wishlist. Tencent bought the name and are the reason all the NovaLogic Delta Force games have been pulled from Steam and stuff. A Tencent subsidiary is developing the game, which is a free to play hero shooter. At this point a game about being a sky marshal on Delta flights would be a closer spiritual successor to Delta Force.
Follow up. I was still able to purchase DF1, 2, LW, and TFD from Steam as a pack for 21 CAD. Playing now via Proton. I do not think they have been removed unless it's a regional issue.
it's in open beta? how do i access it? i only see an option to "join the play test" but when i went through that it just told me it would email me if i qualify