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Probably because the creator created both LLVM and MLIR.

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I'd assume Mojo does more complex transformations at the MLIR level than Rust does at its MIR level.

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First, I'm not sure. Rust has MIR optimizations and also other transformations.

But even if yes, MLIR is part of the LLVM project, so it's technically still "just an LLVM wrapper".

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MLIR is more a library for building a compiler than a compiler itself IIUC. LLVM can be thought of similarly, but IMO, it's more self contained.