We need the price to predict it better.
Anyway, PS5 should outsell the XSX regardless, the question is by how much.
If both are priced equally the prediction looks alright.
If the PS5 is $100 more than XSX we might have very close numbers.
If the XSX is $100 more PS5 should 2:1 it as soon as 2021, not 2024.
As I expect price parity with the $500 pricetag, his prediction seems decent right now.