Unlike the PSVR1, there is no special processing box required to make it work, it’s just power, USB, and a displayport signal, carried by a single standard USB C connector.
And even the PSVR1 got figured out by hackers to the point that the hardware can now be used directly, no PS4 required.
I don’t imagine that any PSVR2 PC compatibility would require using the HMD through the ps5, when you could just plug it directly into the PC.