Your parent explicitly stated that he's talking about JS implementations and not about the language. All you've said may be true, but it's completely off-topic and has no relation to the parent post at all.
Still interesting to people not knowing the other advantages Lua has. Might get some interested in the language.
Not everything has to be strictly on-topic to have merit, especially since we've already derived from the topic (from a specific embeddable JS engine to the comparative merits, implementation wise, of JS vs Lua).
EDIT: typos.