Navi is an AMD technology not a Sony one.
It's Graphics Core Next derived which predates the Playstation 4, let alone it's use in the Playstation 5.
Just like the Playstation 4 chip, Sony will have a list of some design goals for their semi-custom part, but that will be as far as it goes.
Lets hope AMD actually gets it's Draw Stream Rasterizer functioning in Navi... Oh and Primitive Shaders would actually be good as well AMD.
I think the confusion is coming from the earlier report that AMD's next GPU design as keeping the next Playstation in mind.
If Sony wants a large, slow, hot, inefficient, expensive, Graphics Core Next derived GPU... Well. That would be saddening.