JJK MANGA SPOILERS.
no 'cause actually getos question was answered, too. indirectly, but yes. he's the strongest because he's SATORU GOJO. if we analyze it deeply, the answer could be already found in the going north/south metaphor. going north would have meant reincarnation, so satoru would have become someone new, but he would still have been the strongest. in this case, he would have been satoru gojo because he's the strongest. but gojo went south, and he remained dead but stayed himself. the definitive confirm that he is the strongest because he's himself is what's happening to yuta. yuta is in his body, he has his whole potential strenght, six eyes, limtless and everything. and yet he didn't last a second, sukuna immediately broke throught infinity with him. this wouldn't have happened if it was gojo.
i also believe geto asked him not really as a question, more as a reminder of who he really is. after the star plasma incident, gojo completely shut down his personality and feelings, only focusing on his new title as the strongest. suguru knew that it wasn't the satoru he knew, it wasn't the satoru he loved. so he asked him this a last act of love in his regards, hoping that if not in that moment, one day satoru gojo would figure out that he first came as a person and not as a weapon, at least in his eyes.
they make me sick and depressed and they drain my will to live, i love them.