I don't know about 100x, using Box and mutexes it is pretty much as complicated or maybe 2x. If you want it to be efficient and leverage all of Rust then sure, but that wasn't what they were meaning.
Look at the first example. It can be very similar.
Strange example, but I suppose making the corresponding python more complex is one way to make them equivalent.
[1] https://www.starlette.io/ [2] https://fastapi.tiangolo.com/ [3] https://trio.readthedocs.io/en/stable/
One tiny program does not a realistic comparison make, of course. There’s tons of situations where either language can make things more complex than this example. But for basic tasks it’s not particularly complicated.