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He said "may not", which is the same as saying "may".

Ok...this isn't that hard. If someone says you may light on fire tomorrow. You're probably going to ask for a little bit of an explanation.

No, it's not that hard. He could have used the word "necessarily" after "not", but the meaning was still clear.

Ok. Glad you cleared that up...seems like the author of the statement is in disagreement.