True! This statements without analysis are wet paper.
In the article I've linked there is a better analysis on why:
1. in wasmjit, the machine instructions are hardcoded into the runtime (this is like creating your own LLVM, by hand... and only available for x86)
2. it doesn't have a single test
I was talking about my own experience here, because I tried to contribute to wasmjit before creating Wasmer... and was quite challenging!
It might be useful to check how many people interacted with the code in each of this projects! ;)
Also note the timeline that took for this projects to accomplish the same: wasmer (<2 months) wasmjit (6 months)