https://react.dev/learn/react-compiler/introduction#what-doe...
The React cinematic universe has a habit of repurposing existing terminology, but they're both transpilers, to the extent that "transpiler" is even a word.
It appears that I was wrong about the definition of transpilation. It's a specific term for a compiler that compiles from a high-level language to another high-level language, even when those languages are the same with no DSL and even when the logic is optimized.
I stand corrected.
Yes, all transpilers are compilers, but not all compilers are transpilers.