If Roger loses in the final to Rafa, he is not GOAT.
If Roger loses in the QF to Robin, it means he is worse than if he loses in the final.
Therefore, if Roger loses in the QF today, he is not GOAT.
If he loses today he is 12-2 against Soderling. He can lose once in a while against any player, besides he has beaten Robin on all 3 surfaces including the tournaments where Robin has defeated him in it.
But if he loses the final against Rafa
He is 7-15 overall against him
2-7 in grand slams
2-6 in slam finals
losing on all 3 surfaces while winning on just one surface
losing in all 4 slams while while winning in one only
I guess this can not be said as having one or two bad days, especially with the slam h2h.
Edit: by this I don't mean Rafa is superior to Roger. I just say that h2h means something, not everything, nor the most important statistics, but it must be taken into consideration.