PS5 VR code work on base ps4 or just ps5 Backwards Compatibility

So if we bought game on psn store it show ps4/5 game … mean you get both ps4/5 version i dont know when bought ps5 disc version how can we access free ps4 copy? ps5 do read ps4 disc but ps4 wont read ps5 disc the vr code in ps5 version box just Backwards Compatibility running on ps5??? or we do get a free base ps4 version?! thank you

PS5 review: an exciting portal to next-gen gameplay

PSVR 2 release date and backward compatibility: Will it work with PS4 and PS5? - GameRevolution

Is PS5 Backward Compatible: Does it Play PS1, PS2, PS3, and PS4 Games? - PlayStation LifeStyle

Hands On: PS5 Backwards Compatibility - The Good, the Not Bad, and the Ugly

PS5's boost mode is so powerful that some PS4 games can't handle it

PlayStation 5 - Wikipedia

PSVR on PS5: Everything you need to know - CNET

Playstation 5 Games & Accessories, PS5 Gaming

Everyone's buying a ps5 while I've just bought a backwards compatible PS3 that reads ps1 & 2 discs : r/playstation