That’s nothing compared to 9 TdF wins!! Only way that happens is if he gets some major assistance from Vingegaard.
Why do you think so? With their ages and form development I don't think Vingo will ever beat him in a GT on merit.
Mou's numbers is basically just the most optimistic scenario with regarding both Pogacar's level and luck in avoiding injuries, in theory it's definitely possible but in reality I'd give it a 1-2% chance. It would be insanely lucky to no lose any of these big races due to crashes/injury etc. Even still 2/4 (I guess he doesn't do it in 2029) Roubaix seems very optimistic.
In a scenario where Pogacar is able to maintain motivation through 2030 despite all the winning and probably the public getting more and more antagonistic towards him, i definitely expect him to remain the dominant rider for that time and maybe only lose a bit of his 24-25 level by 30. Vingo and VDP, time will favour him, Seixas can maybe become a threat towards the end, I expect Remco to make a jump next year and challenge him, but Pogacar is the better sprinter.
All of this relies on him staying as motivated though.