So, they're classified *now* after the fact but were not earlier. From what I know, and is noted in the article itself, this is not that uncommon.
What a silly, non-sensual argument.
Hillary Clinton, as a Harvard educated lawyer is not, simple-minded, and she knows ignorance of the law is no excuse.
Hillary was taught, first as a Senator, then as Secretary of State, how to identify, mark, and handle classified information (classified means 'confidential', 'secret' or 'top secret' classification).
Hillary was taught that material does not have to be marked with a classification to be secret/require special handling.
Hillary knew that removing a classification marking from a document doesn't make the contents less secret.
Hillary has turned over at least one email exchange in which she instructs an aide to print out material from the classified email system and send it to her insecure home server, the act of doing so is a breach of security protocols and a crime.
As Secretary of State she refused to allow her official email from passing through secure gov't email servers - that is NOT the same as forwarding emails from your gov't email account to a private account, a practice frowned upon, but employed by many gov't workers, including past Secretaries of State.
The argument Hillary supporters would have you believe is that every email sent or received on her server by her or her aides were not classified, that anyone could have read them at the time she got/sent them, but it is only with the passage of time that the information in these emails became secret, requiring classification and special handling.
At it's simplest, the moment Hillary handed her attorney the flash drive containing the 55,000 pages of emails, some of which contained classified information, she committed a crime. General Patraeus showed secret documents to his mistress and was convicted of mis-handling state secrets. Hillary, in handing over state secrets to her lawyer committed the very same crime.