I know some people find that annoying, but personally, I thin k that's fine. If I _am_ interruptible & I do respond to the initial ping it's nice to have some human interaction before the "down to business" part. Esp when we're all remote. If not, I just get the first & second message at the same time and respond to the query.
I think the author is also calling out "doing nothing" even for the meat & bones of the real request — e.g. in his example, even if the collegue did BLUF ("Live Client Issue: Strip integration missing from Xero") the issue still "went away" by itself without his attention if he left it 5min.