>Eventually we will have some digital certificates to show who has recovered or been tested recently or when we have a vaccine who has received it.

he's saying Microsoft and MIT developed "tatoo markers" that show whether you have recieved a vaccine or not. This will be coupled with Gate's new invention, ID2020, which is a digital ID microchip implanted under the skin.

www.sciencealert.com/an-invisible-quantum-dot-tattoo-is-being-suggested-to-id-vaccinated-kids

http://news.mit.edu/2019/storing-vaccine-history-skin-1218

https://id2020.org/