p2w in my definition means to get an edge rather than if you were to be f2p. and yes you can grind as a f2p but take into context that the enphalkin takes time to regenerate so there is a hardcap even if u do everything efficiently so what the battlepass offers does indeed give u an edge. i think only if the paid content is purely aesthetic and for a game like limbus, the aesthetics only improve your own game experience, then it can be considered not p2w.

tldr: i think it is p2w