Our director of cybersecurity did something similar. I asked my manager, what’s going on, he had no idea. Completely unintentional, she wanted to speak about a RFP response, but it was completely out of context and I didn’t know she was reviewing it.
Out of etiquette, everyone should think about context when sending a message. Probably more so in roles of authority and those that own “terminate-able offence” compliance.
Also, people should check their paranoia. I’ve been working jobs for 30 years and never has the bad news or underhanded crap started with a message like this. Not that I don’t sometimes think this is the first time.