Earlier quoted context omitted.
> their accessibility stack is still lightyears before Android. Don't you mean "ahead of"?
That’s what that means, “before” being the opposite of “behind”. It’s just not as common a construction in most English locales as it used to be. It does still get more restricted usage in this sense: when considering the future, “this is what lies before us” wouldn’t sound out of place.
As a temporal reference, it's definitely valid, but it bears a somewhat highfalutin connotation. It sounds like someone who is trying to wax poetic.
Not that I would fault a non-native speaker for using it; it's a very nuanced and probably subjective interpretation.