If this works and passes all of the tests, then it seems like a done deal to me. LLMs are just too good at doing ports where they have a rigorous automated test suite or oracle to compare against. They're oddly bad at following instructions like "port this mechanically, exactly" - worse than a human for sure - but they seem to do a great job of sitting there and comparing results to find bugs for hours and hours. It's hard for me to imagine a world where they aren't used to assist ports, not just writing them but especially refining them.
I suspect this won't have as big of a shit storm as the Bun port in part just due to the input/output nature of the React compiler.
That said, while I use React still, I still have never tried the React compiler... So I have no idea how important this is. But you know, very few people are ever upset over faster iteration cycles or CI builds.