The big boost for gaming is only relevant if you do not use Proton. While there might be some boost for selected games, in general the new Kernel 6.14 shouldn't make much of a difference for Steam gamers using Proton. Because Proton already got some alternative to NTSync mechanism, which improved some titles already.
The benchmarks presented with huge %-boosts and improvements are compared to previous WINE version, which do not have some of the alternative optimizations from Proton. Therefore I would be a bit cautious, if you already play on Steam using Proton.