Super-moon is just a tiny difference, he’s talking about 2-3 times bigger than real life.
It’d be very simple for Asobo to verify as they probably know very well what size they picked for displaying the moon in MSFS. And for something that’s 3 times bigger than real life, I doubt you’d need “proof”, anyone could see it easily.
But if you still doubt the OP’s claim, jump between these two images and compare. Pretty close to 330% of the real angular diameter.:
Probably to make it more “eye-pleasing” is my guess.
Just noticed that MSFS sky is one day off too, had to offset planetarium date with -1 day to match moon position wth sim. (Checked with 3 different software just to make sure.)