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No, just straight out lying.

That could mean anything from "there was a typo" to "there were factual omissions that were unknown to the author".

Or, it could mean you're just be pedantic.

Perhaps they're using the etymological root of aware, which is "wary", and they mean they were unconcerned with its existence as they were unwary/unaware of any possible dangers with it since it was unknown to hostile forces.