They have nothing to do with nfts if you can't sell or trade them with other users and if they aren't in the blockchain.Err… Trophies, Medals, Achievements, etc are just like NFT Awards.
Like I said it is NFT just not in name.
PlayStation Stars, like trophies, achievements or MS rewards or the Nintendo coins are only fidelity rewards to increase engagement that are not related to nfts at all.
NFT is only a technology to allow users sell each other unique digital items in a secure way without needing to make these transactions in a store owned by those who made the nfts. As an example, they could turn the digital games into NFTs to allow a 2nd hand market of videogames. The content of the nft can be any digital item. That's all.