So 3 staff had gotten sick that flu season. Staff who work with infectious diseases and probably get every cough and cold checked out just in case. Seems pretty baseline average to me.
There's no discussion of how many people work at the lab, how many staff visited hospital the year before that, whether it is in fact common for those staff to visit hospital when they have seasonal flu, or any other factors that would put this in any sort of context at all.
It took WHO over a year to be able to enter China. And what did they do? Release a memo denying laboratory theory without any evidence. No bat, nor intermediate has been found (not the case with SARS/MERS). Sure there is no evidence on lab theory either. The Chinese army has been running that lab since this started.