Complementary shaders fork not working with DH

Hey, I downloaded the fork of complementary shaders as linked here, https://gist.github.com/Steveplays28/52db568f297ded527da56dbe6deeec0e
And the beta build of iris from iris discord for distant horizons, and the 1.20.4 version in #links
Still, when loading the shaders, A message comes on my screen that this shaderpack doesn't have DH support, and it actually doesn't work..
Any help in fixing this issue?
Gist
Distant Horizons shader compatibility info. GitHub Gist: instantly share code, notes, and snippets.
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