Yes, this is old tsx files for outdated tileset version. You can use them for free, if you want.
Viewing post in Urizen 1Bit Tileset - 12x12, all themes, CC0 comments
The currently available download only includes a PNG file, and these older TSX files are the only ones I could find available. I draw things with these tiles nearly every day for several years now. They are great and I love them and was just trying to be helpful, that's all! :) <3
I used them as the starting basis for my jam game here (https://tesseractgamingindustries.itch.io/paranormal-alien-containment-personnel); I added some things and drew some new stuff but the core is Urizen tileset with it's cool 12x12 pixels and fun lil' guys!