Reiner was stating a fact, conveying what the state of the affairs is right now, Matt was making a prediction about the future.
I think is safe to say PS5 has an slight edge at this point in time, that both Sony and MS will work on improving their respective SKU's, and that the end result will be 2 machines that are very close in terms of specs, and they have to be the same price really.
So they have to be $499, because there's no way PS5 has the edge while at the same time being $100 cheaper, and Anaconda at $399 didn't make sense when Lockhart was planned.
Of course Lockhart was discarded at the end of 2018 so it could be that after that they made Anaconda less powerful and cheaper, from $499 to $399....but that was semi-debunked by some people, right?
So the safest bet seems to be $499, although I can't really totally commit to it, I still feel $399 is not out of the picture
For me that's the important piece of the puzzle that is missing, because we know both of the will be almos identical, just at what level is the question.