Perhaps I can add that, aside from the technical pieces, I think the key practical aspect of what Mr. McKay is describing is that this is the early stage of a likely broader attack. It's where an actor is trying to get some information, which they would then use as part of subsequent attacks.
We've now been briefed by the FBI on particular techniques that we can use to protect ourselves in the context of this escalation. This is why informing us is critically important. When you know that you're potentially at the early stage of a reconnaissance attack, you can then put in place those mechanisms to better protect yourself. We weren't told, so we weren't able to protect ourselves.