Firstly, the contact is not head or near head.
The ball is closer towards the table, then it is towards the head.
And i'm not sure if a video compilation of all serves that Harimoto winning the serves is a true reflection on how many points Harimoto actually has from direct serving or results of a good serve.
Even if 1 out of 2 serves, he gets a direct point, and works on the 2 point beyond service return, that is still very high. And I honestly don't think Harimoto is that high or good.
His results shows he does struggle to win. So if 50% of the time, Harimoto is serving, and everyone else who has problems reading is actually having a problem, Harimotos result will be much better and we all know and can see the wins/loss.
I never felt Harimoto's serve is one of the best. But with his aggressive nature, his overall strategy is actually well thought of. His execution is a problem at times - that is why his result won't be high up there.
Serve is part of a strategy. It isn't to win the point out right, but to win in the mental combat and to make your opponent over think and have doubts.
Many times, the 3rd ball, 5th ball doubt is what make service return errors. So its all link to each other, hence, Strategy.
Having said that, when he is not screaming, his body language shows sign of mental weakness. More opponents knows how to play him now and I wish he can overcome the short term problems and become a more complete player.