Sony aren't going to let you run your PS1 discs, sorry dude.
I don`t even know if the PS5 driver reads CD (sure it technically could), I know that PS4 could and even though we had the ports of PS1 titles you couldn`t run from the disk, that is more on the Xbox side (well you don`t use the disc itself, you just validate your license).
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"
Azzanation: "PS5 wouldn't sold out at launch without scalpers."