Does he claw the sides of the furniture? Or like the top of arm rests? Some cats are vertical scratchers others are horizontal scratchers.

Have you tried double-sided furniture tape? Cats don't like the sticky feeling on their paws.

Catnip on posts will help with attracting cats to use them.

As far as furniture, I'd get microfiber couches. It's easy to get fur off, and there aren't obvious threads that attract cats to clawing it. I also recommend a fur glove for easy fur removal. https://www.amazon.com/CleanAide-Hair-Removal-Cleanup-2-Pack/dp/B003USZI06/ref=mp_s_a_1_12?crid=R3SLX31OIZ0H&keywords=defur+glove&qid=1686149400&sprefix=defur+glove%2Caps%2C171&sr=8-12