I did a quick once over from the quoted process numbers.Hmmm interesting. Thanks for the tip on the name:
So N5P uses the same design rules as 5nm, meaning AMD could go from 7nm+ -> 5nm -> N5P/"5nm+" without skipping a beat. It looks like, in terms of design rules, 6nm is a dead end.
Using the 15% power reduction over N5 - N5P gets just under a 50% power reduction at iso power over N7, and just under a 30% power reduction over N7+.
If AMD skipped N5 to N5P it would make a nice power reduction over 7nm+ Zen3, closely matching the area reduction if I remember correctly.
This seems more likely than N3, or whatever Samsung's 3nm process is called for Zen4.
The lack of AMD identifying their post 7nm+ process is the only thing making me wonder about this mind you, don't quote me on it.