Piano Forum

I have seen two other versions of this piece
Huang Yi-Chung
Seon-Yong Hwang
Huang Yi-Chung, in the link, said he worked on the piece everyday for basically 9months and picked the best recording out of 10 times he attempted it, and he is someone who played Alkan Le Preux (since the forum cut the timestamp, Le Preux starts at 2:45:00 exactly) in a competition just after playing Liszt - Réminiscences de Lucrezia Borgia  &t=9895s .

Seon-Yong Hwang sync the piano sheet while he is playing.

Given the lack of video or audio publication, my guess is that there isn't enough profit to spend one year to practice a piece while a pianist could just collect easy money in concerts/teaching or showing up on TV.
And after spending decades practicing 10h a day, who wants to continue to do that for a single piece?

I am just a parent, so I cannot say anything about the complexity, but the endurance, both physically and mentally has to be up there as one of the hardest Liszt piece.

Some times ago, I stumbled on this list which "ranks" Liszt repertoire https://www.reddit.com/r/piano/comments/i1t09y/guide_to_liszt_pieces_by_difficulty/