We've had some experience here with exposing fake recordings, and I do think this sounds a bit artificial, especially the run at 1:25, with the repeated note at the end, and the impossibly smooth diminuendo at 1:33. One would have to be extremely
skilled for this, and it's unlikely that your hired player is such a world-class artist. His asking for the Sibelius file would have made me suspicious too. Though I'd not bet my life on it, I think this is a fake. Although... would any serious music student, which I understand he is, be so stupid ? Could also be it's heavily edited and/or
Ask him what piano it's played on, and demand a video playing on the same. This usually exposes con artists.
Good piece, by the way, full of brio and invention. It is worthy of someone's serious attention IMO - though it would be a hell of a lot of work ! I like the title too