Not long ago, we reported that a new Patent from Sony shows that the PS5 and PS4 may be backward compatible with older games that will be backward compatible with PS1/PS2/PS3, and recently a new piece of news seems to further support this claim.
Game media person Jordan Middler posted on social networks today that it found that the PS3 game Dead or Alive 5 appeared in the PS5 game store with a list price, and usually the price of PS3 games cannot be displayed in the PS5 game store.

Below this tweet, some netizens released that the games he found on PS3 last October, "Prince of Persia, Sand of Oblivion" and "Prince of Persia King Matchless" also appeared in the PS5 store. Sony's new patent for backward compatibility was filed last September, indicating that the PS5 may have been able to be backward compatible with PS3 games at that time.