Only because it's Rainer,
You do me an honour I'm not sure I deserve.
did I listen a second time (focusing on just the RH) and a third time (focusing on just the LH), and I for one cannot find anything to criticise on Monica's rhythm.
The effect is not everywhere, and only very slight where it does occur. It doesn't detract from the performance, and it's not something I'd expect anyone to notice by focusing only on the triplets or only on the duplets. That's because the time distance by which an even-numbered duplet is off the midpoint between odd-numbered duplet neighbours is so very small compared to the size of the inter-duplet interval. To be able to detect the effect, you need to compare it to events which are closer together. The following approach amplifies your sensitivity by a factor of three:
Subdivide each beat (each quarter note) into sextuplet pulses, let's call them ABCDEF. Then the RH triplets fall on A,C, and E, and the LH duplets on A and D. Nothing happens on B or F, and therefore you should hear a sequence like A_CDE_A_CDE_A_CDE_ and so on. Focusing on the CDE groups, D should be exactly midway between C and E, but I thought I could occasionally feel the D drifting a little closer to the E than to the C. I think it's because D is late, but I'm not sure, it could be that C or E or both are early instead. It's only by a teensy weensy bit, I barely even noticed it myself, and now I wish I hadn't said anything.
My experience with sesquialtera is that either a person can do it well or they can't. Monica clearly can do it well.