This channel is run by fellow fan Kirbologist, also known as Boolea.
I upload and document various old Touhou PV's and movies made using Flash in native 4K (and occasionally upload some other lost content in their original quality as well). This is part of a project to help modernise, restore and preserve old Touhou doujin movies, given that Flash player has ceased being supported by most modern browsers and OS's. PV's that only released as videos generally aren't uploaded, since I wouldn't be adding anything new.
English translations are mostly provided by the Touhou wiki. However, some of them don't have translations available, so I've had to translate them myself. I recommend not to use my translations directly, as my Japanese is not that great and there's likely plenty of inaccuracies. You can find in the video descriptions how the translations were retrieved.
Other sources, credits and resources listed here: pastebin.com/DqKzB4RG