Indeed. In my experience, LuaJIT is insanely fast and is widely considered to be one of the fastest dynamic languages around. The term "scripting language" is, in my opinion, meaningless these days, but either way, claiming to be as faster than LuaJIT and aiming to be faster than C (while compiling to C++? [1]) and not demonstrating this to be true just seems pretentious.

[1] I guess it should be faster than hand-written C, which is, of course, possible. ATS supposedly generates C code which is very competitive.