modern chess programs are vastly superior to human players, regardless of one or 38 cores.
stockfish has a elo rating of ~3350 (probably a little higher when running on 38 cores, not sure). carlsen has 2850. that corresponds with a 95% winning probability per game (or to be more precise: stockfish is expected to win 95% of all possible points over several chess matches)
it's hard to say if that's close to "perfect analysis", because we don't know what a perfect game will look like (chess is not a solved game). but compared to human level, one could say it's close to perfect.
I'm not saying Stockfish isn't stronger than any human player (even the world champion), but you can't compare ratings in two different systems like that. Magnus has never played a FIDE-rated game with Stockfish, nor has Stockfish played any rated games with a human opponent.
it's hard to say if that's close to "perfect analysis", because we don't know what a perfect game will look like (chess is not a solved game). but compared to human level, one could say it's close to perfect.