if my recollection on some of his earlier years are correct, scriabin was a pianist first and composer second (this in contrast to his classmate rachmaninoff who has been referred to by music historians as composer first and pianist second--they were pretty much neck and neck pianistically early on , scriabin winning second and rachmaninoff winning first at the conservatory/school's piano competition).
i dont remember which liszt piece it was exactly but the story goes scriabin was practicing it for hours and hours on end and he essentially overpracticed/overtrained/whatever you want to call it but ended permanently injuring his right hand, cutting his dreams as a concertizing pianist short.
we can see and hear evidence of his in his first sonata the final movement in particular (funeral march) which is a musical farewell so to speak, the death of a dream...
supposedly partly due to the fact that the injury mainly affected the right hand, he continued to compose (focusing more on composition later on just like rachmaninoff continued to be pianist/performer later on) some very demanding parts for the left hand in particular, much of his music has notoriously hard sections for the left hand to maneuver while the right hand remains relatively docile, benign almost.
my take? he could have played anything and everything he wrote prior to the injury. he was that fine a pianist.
edit: just came across this, it was the Don Juan fatansie by Liszt:
"...Scriabin started out as a prodigy pianist, studying as a boy with the renowned Moscow pedagogue Nikolai Zverev, whose other star pupil was Sergei Rachmaninoff—interestingly, Scriabin started out as a pianist and ended up a composer, and to a large extent, Rachmaninoff started out as a composer and ended up a pianist. A hand injury, suffered supposedly while over-practicing the Don Juan Fantasie of Liszt, forced Scriabin to turn to composition—two of the most famous left hand pieces in the piano repertoire, the Nocturne and Prelude Op. 9 were of course, a direct result of this, and later, also the 1st Piano Sonata. Although he eventually returned to the concert-stage, his right hand never was quite the same, and may explain why in so many of his compositions the left hand is technically the equal (and often surpasses) the right hand. Cesar Cui, in a concert review of Scriabin from 1905 complained that Scriabin’s left hand actually overwhelmed the right..."