Picking up a ruler and doing it, incredibly accurate. Which one of them do you prefer to believe in?
Raja Koduri himself or PCP/GN? There is a packaging around the die to the HBM2 stacks. Measuring things you don't know how to measure only gives you inaccurate numbers. They did a good job taking into consideration what they could do, but that doesn't randomly change the actual size of the die.
To be honest the rest isn't even worth replying to, we still don't know whether the GPU is working with all the features or not. Just like the die measurements were all off, even if those rasterisation tests were all pretty convincing they could be wrong too. We don't know enough about the product to make conclusions yet, yes it could be a huge wasted effort with improvements that don't really translate into real world benefits in gaming scenarios, but it could also be that the software wasn't ready and they played safe to avoid functionality problems.
We simply don't know yet, the gaming cards aren't here. What we have here is a prosumer card that aims to do both, and currently isn't exactly doing either that well.
If that's the actual gaming performance, they'll just price it accordingly in order to still be able to sell a product. And it would be a sad failure.
If it isn't, we should see the actual performance once the gaming cards are released. The damage done by releasing gaming cards with bad gaming drivers is much more problematic than releasing a prosumer card with bad gaming drivers, so I hope they won't do this.
Again, let's wait and see.