That's by Squarepusher, not Aphex. Tom should upload it, yes!
I thought that was never totally confirmed, but anyway Tom jenkinson should release it then, hopefully aphex inspires other artist to do this by now!
A lot of these soundcloud trax are better than a lot of aphex his mid 90s stuff. Just really like the raw and not overproduced quality of it.
Make what you will out of this:
I'm not sure how to tell whether rich's comment is a response to just adar's comments or if it's a response to the first two comments in the chain or the last two comments in the chain. this means there are three possibilities; 1. rich is saying that he will release the track and it is not a collab 2. rich is saying it is squarepusher and it is not a collab 3. rich is saying that he will release the track and it is squarepusher.
The third possibility doesn't really make sense so there's only really two possibilities, either it's just rich's and it will be released or it's just squarepusher's. Either way I think this confirms it is by Richard or Tom.
I somehow had in mind this had been confirmed to be a squarepusher track anyway. Didn't Squarepusher play it live once..? Not that this itself would confirm it.
Anyway.. Cylob played it at his dj set at Radio Melyseg Titka back in 2003. On the official tracklist he wrote "Acid White Label".. so I guess he would know. If someone knew Chris well enough.. On the other hand I can very well imagine he wouldn't tell anyway.