I saw DarkViperAUs video about the game breaking glitch for speedruns but haven't seen any runs? Is that because people are still experimenting and finding strats or because nobody wants to genuinely run it?

garbage category nobody wants to run.

The only major category that DM is allowed in is any%unrestricted and 100%unrestricted. There's been one or two runs in the any% but none in 100% yet