Here's a 25 video critique on the CMB projects by Pierre Robiteille

https://youtube.com/playlist?list=PLnU8XK0C8oTDaiwe8Us_YNl4K...

He also has an alternative theory for stellar physics that might call into question the interpretation of Cepheids and SNs, tho I don't think he's done a major analysis there, at least afaik