The reason you think it sounds like Hardstyle is because it's the only genre you know of that uses such a prominent kick with a long decay. Aside from that, the BPM is wrong, the synths are wrong, the kick is too high pitched and not the correct reverb sound, the structure of the song is wrong, literally everything aside from that kick is NOTHING like Hardstyle. Your misclassification is a result of ignorance, even Ephixa didn't classify it as Hardstyle, he classified it as "Yacht House."