I think this is called "transpiling" -- a version of compiling that's mainly translating from another architecture. And it didn't sound from their description like it was JIT -- it sounded like it would do the transpile when you first installed it (or maybe first ran it?) and keep the results.
Transpiling (as much as I hate that word, because the more you know about compilers, the more meaningless it is), is about source to source translations, not binary translation.
And they have a first pass AOT, with a JIT backup from the sounds of it to support JITs like browsers, node, and java.
I think this is called "transpiling" -- a version of compiling that's mainly translating from another architecture. And it didn't sound from their description like it was JIT -- it sounded like it would do the transpile when you first installed it (or maybe first ran it?) and keep the results.