Which apart from the occassional use of the third on the bottom note is actually in line with what I had in mind.
Given that he is accompanying a singer in her audition, I would imagine it has to be played at whatever tempo she has determined for the aria, so "at tempo" is pretty likely.
@ N - I don't understand your moving from fixed position to fixed position at all. My hands move around as required, and pretty constantly. I'd never regard them as fixed>move>fixed. Maybe I'm misunderstanding.
I don't mean fixed but prepared. Fingers are positioned at the ready in big groups of prepared notes but the arm is free to do subtle drifting motions from side to side while keeping every finger on the key it will be needing- without performing the big realignment of starting a brand new position by dragging the whole hand over (except when it's necessary to start a new one).
Perhaps you didn't mean the thing about 1 and 2 as a guiding principle (implying avoidance of the third even if available for use, within a big position ) but simply for particular spots where it keeps things in a single position? To avoid implying the exclusion of any 3s at the bottom I'd see the leading concept as being one of positions rather than the details of any individual finger. Avoiding 3 means making hazardous and totally unnecessary leaps at the start and especially in bar two. I rarely think in single finger numbers but in terms of chunks under the hand as one single entity. With students, I prefer to bracket large groups of notes and let them figure out which finger goes where to make that happen, rather than detail every number (unless some unusual detail occurs). When you get used to thinking this way, you scarcely need to think about individual fingers but simply feel your way around a whole group from the start- without fingers finding notes at short notice. The fingering given is very much in line with this principle of big integrated chunks rather than a fast rate of riskier position changes.
PS in bar 2 id take 13 at the top (a and c sharp) and and follow with 35. The rest is then a single easy position that covers the whole bar. It would be extremely risky and more complex to have a formula of 2 for black keys and 1 for whites, with so many individual shifts and many cases of needing to go between two notes with the same finger. Integrating into the largest possible groups is easier both mentally and physically.