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Yes, Go is fast enough for some tasks.

Before this I was doing C and PUC-Rio Lua. Was obsessing too much with C pitfalls, valgrind, and the sanitizers. Then LuaJIT FFI + Rust, good I like it better but found GopherLua the easiest. I'd stick with LuaJIT+Rust for anything that needs less resources and speed.

Go has all the required primitives, unsafe and assembler as part of the toolchain.

If he really wanted to, he could have written it as a JIT and generate ASM directly. Writing an executable page is quite trivial in Go.