Do you have a source?
It seems 15,000 is an awful lot. But it's possible. However, the date would be very important, as the Wuhan lab was more like a small thing before the University of Texas paid them five million $. That seems to be the point where the lab started expanding and professionalising in order to meet US standards.
Also, 15,000 is a lot to study. Unless you can heavily automate. There was no real automation in the Wuhan lab in 2017. It was one of the things that slowed bat research down, as the entire capacity of the lab wasn't even sufficient to keep up with samples from bats alone.
