technically mature but emotionally unmatured so this performance means nothing to me piano playing is not a sport
What on earth is musically immature in this performance? I strongly disagree.
I strongly agree with you, pianoloverus, and with Mark_C and dogperson. It was precisely because of the extraordinary maturity evident in the performance of the music
that I listened to the end of the video rather than switching it off after 10 bars, which is what I usually do when I hear 12 year olds playing technical showpieces. Moreover, the interpretation sounds authentic to me, "owned" in a way that can't be just taught like you'd teach a parrot. The dynamic shading, the discreet agogics, the powerful sense of direction and forward motion, even in the face of the most difficult passagework (with one tiny exception), the careful pedaling, the clear appreciation of the structure, the appropriate articulation/delineation of the lines and contrapuntal elements: these aspects of her performance are not figments of my imagination! Nor are they some kind of fakery. I devoted several years to an analysis of the etudes and I think I can recognize the real thing when I hear it.
Chopin's etudes "are the only extant great works of art
that really owe their character to their being Etudes." (Tovey, see here
; my emphasis. Tovey wrote this 15 years before Debussy's Etudes were published.) IMO this young person has reached a level of maturity in her playing and interpretation where she truly seems to appreciate this defining aspect of the piece she is performing.