Right now, PC is the only confirmed platform. The official store listing is for PC, and FLEXUS has not announced a PlayStation 5, Xbox, or Nintendo Switch version.
That does not rule consoles out. Plenty of indie co-op games launch on PC first and port later — and some never announce consoles at all. Lethal Company, for example, launched on PC and has not committed to a console version, while Overcooked! 2 shipped across PC and consoles on the same day. Both patterns are common.
The honest bottom line: only PC is certain today. If a console release happens, it would typically be announced alongside the exact release date rather than before it — so the same official channels worth watching for the date are the ones that would confirm consoles.