Nonsense.
Big dies present exactly the same problem for both NVidia and AMD. It increases production costs, and usually some/all of that gets passed onto the consumer in the form of increased retail price.
Right now Vega 64 is going for almost $100 more than GTX 1080, despite both companies reportedly having excess stock to clear. That bigger die on Vega is a large part of the reason Vega 64 is trying to sell for a much higher price.
It's also a large factor in why the new RTX card are much more expensive.
That is reality. Big dies increases production costs and selling price for both NVidia and AMD. That reality doesn't have a bias.
The only issues are from people who want to pretend that reality doesn't exists, and that massive dies don't drive up production costs.
So they pretend that those big dies were never a problem for AMD's competitiveness, and that the price increases from NVidia have nothing to do with increased die size.
If you need a bigger die than your competitor to deliver the same performance, then it will hamper how competitive you can be. The bigger the delta, the bigger the problem, because you can't really compete on price without killing your margins.
That applies equally to NVidia and AMD.
It's just that until RTX, AMD was suffering the Big die disadvantage.
Now that RTX has massive die, it could turn the tables. Which, BTW, is exactly the point of this thread.
Can AMD take advantage of NVidias big die problem? The RTX tax on die size is the exactly the opening we are discussing.