Is this comparing normal Rust vs Moji with SIMD? I don't see how Mojo can produce faster code than C/C++/Rust. Must all be in the implementation details, I feel this is a misleading title if so.

see https://viralinstruction.com/posts/mojo/. this compares a Rust parser that does some validation to a Mojo "parser" that doesn't do any.

Good point, and also from the article you provided : I'm sorry but this is not a serious parser. To be fair, the repo is pretty clear that:

Disclaimer: MojoFastTrim is for demonstration purposes only and shouldn't be used as part of bioinformatic pipelines