you can't. unfortunately that's the price I suffer for picking 1.20.1, apparently Forge just sucks for that version.
If you wanted to play with this mod while testing a different mod in IntelliJ, sorry. It just isn't possible.
Forge just can't (de)obfuscate the file correctly.
Maybe JEI will work. Maybe not.
Try some better mods, okay? You've come this far. You won't just give up now, will you?