My opinion...
There's no such thing as "AI" music/sound creation! I can notice that there's a big hype about AI "whatever" lately -simply because it sounds smart and superior.
Those who know something about programming know that it's impossible for a program (which must be written by human), to invent/create something out of nothing. Everything that happens inside every program is predefined by human and so is the result -no magic here.
Improving sax (or any) voice... what does that even mean? It can't be improved, it can only sound differently. And that can be easy achieved by using well known existing techniques: EQ, sound effects, compressors, cutoff filters, etc. And that's exactly what AI tools are doing. The only difference between human and AI is, human will apply settings depending on what he wish to get. AI can't know what sounds best in particular case and so random settings are applied, where randomness is defined by human's programming according to certain criteria -and that criteria is (again) defined by human.
In short: AI sound improvement program is a lottery of sound settings.
I checked both files that rodrigo posted and I personally prefer original. Pay attention on short low tone at about 10 sec from start and you will notice that in processed file, that tone just doesn't sound right. AI can't know that, of course.. AI doesn't really care about that.
Just my 2c,
Bogdan