@Shofast did you do a fresh download for Driveclub or transferred your old game data from the PS4? Because the game have been removed from PSN that might be the reason a couple DLC packs are missing. If you have the complete set on PS4, I imagine it should transfer everything over no?
The 2 packs he mentioned are released near the end of the game's life I believe: No Limits (R34 GT-R and Civic Type R) and Finish Line (Regera and XJ220). All quite desirable cars and it would be a shame to lose them
The 5 club cars (Golf, Conti, M3 GTS, BAC Mono and Zonda R) are still playable now on PS4, assuming you didn't leave your club before the server shutdown. I still grind accolades everyday so I know this. The question is does the PS5 "knows" you've been in a club before?
Honestly, I'd just stick to playing DC on PS4