I certainly doubt the veracity of the performer in your initial video, but how about this? Back around 2002 a scratchy, barely audible, recording surfaced claiming to be a recording of Chopin Playing Chopin (The Minute Waltz). I, and most everyone else, passed it off as a hoax, as there were no recording devices in existence at the time of his death in 1849, but I tag it here for you to have a laugh. Also, a few years ago someone claimed to discover a score (or fragment) Chopin wrote in his final days of life, and it was "realized" by a contemporary performer (I can't find a copy at the moment), but it was highly uncharacteristic, a brief study in dissonant triplets in both hands, and nearly everyone made the same assumption that it was most likely a fraud.
L.