The Standard CPython first compiles to bytecode, then the interpreter translates every instruction as it is ran to the correct instruction for the local platform.
A JIT like this, or PyPy compiles to bytecode, then compiles (some of?) the bytecode to the correct local instructions before running. This means it doesn't need to translate every instruction as it runs.
Projects like Nuitka/Cython compile ahead of time for the platform. So you would either distribute binaries, or have them be compiled at install time.
In any case the only point I was making is that if they made a one to one translation of CPython to RustPython it would not make much of a difference. However, the fact that they are working on a JIT definitely would.
As far as wasm, I beleive it is just building the entire RustPython interpreter as a WASM package. Which I guess would be so you could load it into a browser and then use it to interpret your python code. I suspect this approach would likely be slower than all of the above. Or at the very least be highly dependent on the Browser it is running in.