remember point 1, I don't like the piece :-) but in my opinion, saying it was played badly is not enough to justify its low level. How should I put it, if it were the Moonlight Sonata it would still be a masterpiece, even if played badly, and we could say "Delord writes well but plays badly".
In my opinion, however, the problems with the piece are different. It's long, you can't tell what the pauses are for, the harmonic progression is always the same, and also the rhythmic configuration; the piano writing is banal, there isn't even a recognizable melody.
Let's make a comparison with Nyman's most famous piece, "The Sacrifice" from "The Piano" soundtrack
https://www.youtube.com/watch?v=QsxHuW26rc8
here the piece is not very long, it has an engaging structure, a climax, harmonic movement; even the single-voice counterpoint writing (which we have discussed elsewhere) manages to be varied, because the notes that form the melody are in different places every time, and with the final slowing down—a very simple procedure—it manages to give a sense of conclusion, of cadence, and in a very original way.
But I will also let you hear William Duckworth, a less well-known composer but who is the true spiritual father of easy listening piano and post-minimalist compositions for piano. This is the entirety of his first book of preludes.
he writes preludes, which is a kind of "stroke of genius" because effectively all these compositions are preludes, or toccatas, in intention and form (free). The single-voice counterpoint writing is varied in a thousand ways, with very interesting internal rhythmic subdivisions, despite being minimalist. He manages to create variety with minimal means: piano and forte, oppositions between different parts of the keyboard, major-minor ambiguity. From a harmonic point of view, he seems like Bartók, quite unlike Allevi! And that is why when I hear Allevi I get angry, because people like Duckworth HAVE succeeded in making post-minimalism for piano interesting. Okay, they are not absolute masterpieces, but they are interesting pieces, not just pleasant ones.