Welcome to the forum Kam H. And very well spotted - yes this guidance has now been updated as you suggest!   I have looked back on wayback machine and it appears it was changed in late 2020. This snapshot from 18th November 2020 still shows it how it used to read.   https://web.archive.org/web/20201118013808/https://www.fda.gov/media/134922/download   I think what must have prompted the update were the claims made by the CDC that they had isolated the virus in June