It's interesting to watch eg. Semei and Chopin from 2015 GPF (they keeping popping up in the Japanese TV shows lately), and compare with more recent performances, even just practices.
Yes, they are "recycled" programs, but they look very different now, to my eyes... and I don't mean the extra quads.
His movements have more amplitude and power, and he is more precise and controlled... yet he looks more fluid and effortless. His skating has noticably improved since a couple of years ago, and his performances of those programs are accordingly better too.
I'm not sure it's possible to reflect that in his PCS though, because they were already giving him close to maximum back in 2015...!
No surprise to me, that he set a new WR for SP at Autumn Classic - I think he can
easily break it again this season, especially with a 4L... and as for a clean performance of Semei, it's likely to be mind-boggling...