I wonder if Zen 4c is going to trickle down to the consumer market. There are multiple possibilities for CPUs with mixed chiplets but who knows if they really make sense outside the server world. It's exciting
In the subscriber only section it was mentioned there will be some Zen5 consumer parts using Zen5c as the equivalent of current Intel E-cores.
If there was nothing wrong with it OP wouldn't feel the need to use a throwaway account.
There is a lot more detail in the article on the possible 4c/5c uses, it's been speculated in a lot of contexts for the hybrid configurations (even by AMD directly) so don't think it's surprising to mention this at all.