I also don't like prescriptivist theories of grammar very much

Me neither. I'm bringing up dictionary definitions as descriptions, not as prescriptions. I happen to agree with the dictionary (and it's not my native language anyway), and since you seem to use a different meaning/definition, please tell me what it is!

and think that the original comment was clearly understandable

I, at least, apparently still don't understand it.

Or rather, I understand the intent (because it's been explained) but can't understand how that intent can be read from the original words.