You're absolutely right.
That briefing, as I understood from the director of CSIS, would reveal the minimum information necessary, in the CSIS director's judgment—none of this is decided by a partisan person—for that particular leader to take measures to reduce the threat. That's why it's called a threat reduction measure. However, it would not provide, in that particular threat reduction measure interview, a broader threat landscape briefing or a broader briefing about certain threat vectors than one would get if one were to have the top secret security clearance.
Again, Mr. Turnbull, what's important is that all of that information that would be shared, whatever instrument was used to legally share that information, would bind the person receiving the information to the provisions of the criminal statute known as the Foreign Interference and Security of Information Act.