This is wrong.

The classification level of information is determined by confidentiality of the information's source. This is done to protect deeply embedded or highly technical means of information gathering.

For example, information that could have only come from the second in command of some organization would require the highest of security classifications whereas information that could have come from any dozens of members of that organization would only require a confidential or secret classification.

Information is required to be classified at the lowest possible level, a guideline that is both taught and enforced throughout most if not all of the Intelligence Community.

source: I was an intelligence analyst for 6+ years.