Said PDF?well, there is a link to an interview (in a pdf form) where apparently the team lead admits that, but I didn't read it. I still would say there is a link
View attachment 225303
Edit: As I said initially - I hope there is more investigation into this. Journalism will never be as rigorous as a scientific peer-reviewed paper, but as journalism I think it makes a good case that there is more to find.
https://www.sciencemag.org/sites/default/files/Shi Zhengli Q&A.pdf
....and complete quote? To be found at the bottom of the PDF.
"Q: Given that coronavirus research in most places is done in BSL-2 or BSL-3 labs--and indeed, you WIV didn't even have an operational BSL-4 until recently--why would you do any coronavirus experiments under BSL-4 conditions?
A: The coronavirus research in our laboratory is conducted in BSL-2 or BSL-3 laboratories. After the BSL-4 laboratory in our institute has been put into operation, in accordance with the management regulations of BSL-4 laboratory, we have trained the scientific researchers in the BSL-4 laboratory using the low-pathogenic coronaviruses as model viruses, which aims to prepare for conducting the experimental activities of highly pathogenic microorganisms. After the COVID-19 outbreak, our country has stipulated that the cultivation and the animal infection experiments of SARS-CoV-2 should be carried out in BSL-3 laboratory or above. Since the BSL-3 laboratories in our institute do not have the hardware conditions to conduct experiments on non-human primates, and in order to carry out the mentioned research, our institute had applied to the governmental authorities and obtained the qualification to conduct experiments on SARS-CoV-2 for Wuhan P4 laboratory, in which the rhesus monkey animal model, etc. have been carried out. The experimental activities are supervised by our institute’s biosafety committee and complied with the biosafety regulations."