Great interpretation. The tempi in both the prelude and the fugue is steady, which I (personally) prefer for this prelude/fugue pair. The voices are clear and distinct throughout. The articulation seems to me faultless.
I can find nothing at all lacking in this account.
The Steinway D is nicely tuned; the unisons all spot on. The microphone(s), however, could be placed much closer to the instrument. But that is a separate matter, obviously; not related to the interpretation itself. With such a decent-sounding "D" you may as well get the best you can out of it.
Mic placement is HARD. That's for sure. But probably worth spending time on it, since both the piano and the performance merit it.