"If", then he goes on to give a huge range, and then goes on to say that he can't give even an estimate of what percentage would be symptomatic.

Then, he goes on to give an entirely different range on Twitter, including another statement that he should have said "without effective controls" - https://twitter.com/mlipsitch/status/1234879949946814464?s=2...

So, basically, you proved my point that everyone is so damn eager to talk about this that they'll make claims without sufficient evidence and scare people into distress.