Are you just here to troll?Yeah, so why are you comparing 7nm to 5nm? They are priced differently and one doesn't even cut into the production of the other.
Increasing the transistor count on 5nm will yield less cores per wafer than not increasing transistor count, there isn't even any room for discussion there, the die size you mention and link to doesn't even tell us if it's the same transistor count as previous zen which it very well could be.
TSMC already announced a 20% increase in all prices, if AMD increases that by another 25-35% by adding that amount of transistors more then the final price will be 45-55% higher which would be way too high.
The price increases for 5nm for AMD are far less than the density increase. The peak density increase of 5nm over N7 is 84% btw, with SRAM shrinking by 30%. On top of that, AMD uses custom libraries for Zen 3 that have lead to Zen 3 only being a small percentage of the density N7 is capable of.