He plays much more FH in general these days, of course this is also a result of his opponents serving short to his FH avoiding the BH flip. In the rallies he improved his FH topspin a lot.
Not only Hayata can't play, several promising chinese players are not allowed to play. Yan An, XIANG Peng, LIU Dingshuo, XU Yingbin. Japan removed 16 male players because of this.
Finally Harimoto beat Pitchford. If he plays his A game he destroys almost all of his opponents, it's such a big difference to WTTC or even youth olympics where he struggles when he feels much more pressure, especially against underdogs.