Gunn has been clear (and by "clear" I mean "kinda confusing") that his DCU, starting with the Creature Commandos cartoon, will be its own separate continuity from prior DC productions. Where this is gonna get weird is in the case of things like Blue Beetle and Peacemaker, which are apparently going to carry over elements from their DCEU incarnations to the DCU versions, and at the same time represent a continuity break. So the first season of Peacemaker won't be canon to the second, but per Gunn almost everything will carry over except whatever is explicitly incompatible with the DCU (e.g., the portrayal of the Justice Leaguers). It strikes me as ill-advised and frankly a little self-serving on Gunn's part; he recasts and reinvents other people's projects but not his own existing baby. It would have been a better idea to make a clean break with all things DCEU, if he's going with a new universe, IMO.
Then again, I don't give two hoots about Peacemaker, so I don't really care what Gunn does or doesn't do with it for my own purposes. Ditto Blue Beetle.