Chris, on my website I wrote precisely "All the tracks performed by Claudio Colombo, on Yamaha digital pianos". It is very clear. To perform does not mean recording live. All people native speaker of English I know confirmed me that, when I did launch my website.
Here I put my live recordings: http://www.claudiocolombo.net/acustiche.htm
. And in that page I wrote clearly: "Live" audio recordings by Claudio Colombo, 1985-1989, and 2008. If you want, I can upload some of this files on "Piano Society".
Otherwise, the "speed up" method is used only in some cases, and not because lacks of my technical skills, but because I prefer working on a "projection", from a musical perspective, to editing and/or cutting, and because the keyboard of a digital piano does have mechanical limits. I'd rather recording on my Bechstein acoustic piano, but I don't have a recording studio.
I am a teacher, not a concert performer (my last public recital was in 1988), and I am not searching for personal glory. Only respect for my work, as much as I respect yours.