The explanation is quite simple. These "playstyles" introduced in the game are actually some upgrades to the animations. They have nothing to do with the player's skills in the sense that he receives a "boost" to be more efficient than other players with the same roles but without having this random playstyle given by the game.
As for the player's skills compared to the animations of "his plays"(the way he manages each phase, either offensive or defensive) compared to those of 2020 or previous years, it was NOT upgraded at all. The player's pattern is the same, even if the playstyle is activated.
You can upgrade that playstyle until you reach "master", but you will be surprised that there's no difference in the player's efficiency pattern. You will see some "cool upgraded" playstyle animations, but I don't think it pleases you when your player will hit the moon even with the empty net or blocked by a 1% player.
Invest with your head !