My guess is that the V4 pedestals provide the benefit of magic docks + longer cables for non-Tesla charge port locations, and that's about it for now. True V4 cabinets are probably still under developing/undergoing qualification.
So whether they are "rushing" it out to get NEVI funding, or simply getting V4 pedestals out there for an expected rush of non-Tesla vehicles that will soon be using them, is speculation. Maybe a bit of both.