The stars really aligned for Gukesh in countless ways, his form and openings hit when and where they needed to, and he was left playing a very out-of-form world champ who wasn't even in the top 20 in the world.
I suspect his record (world champ at 18) will remain intact for many decades yet to come. He attributed much of his success to God, and even as an agnostic - I'm inclined to agree!
Notably he's still nowhere near the strongest player in the world - he's not even the strongest Indian! The world championship in chess can be an odd beast at times.