Not applicable specifically to Quine Relay, but the author gave a few interesting talks in English over the years at RubyConf where he discusses some of the obfuscated code techniques he uses:

https://www.youtube.com/watch?v=6K7EmeptEHo

https://www.youtube.com/watch?v=IgF75PjxHHA

https://www.youtube.com/watch?v=ky1GNpT1dEw