A customer just contacted me about a CEP panel and said that Adobe support told them “…Extensions are not supported for Mac computer using the M1 processor. Please try and find plugins with the same functionality or contact the extension owner to get your extensions ported to UXP to run as native on M1 devices.”
That is incorrect, CEP will run fine when PS is launched under Rosetta (by setting the flag under “get info” for the actual app, can’t choose the option when right-clicking an alias to the app).