For the NCAA guidance, I’d go straight to the source rather than a site with what appears to be a partisan slant. Here it is:
Important to note this passage:
“ For the purposes of this document, the equivalent of “fully vaccinated” is a documented COVID-19 infection in the past 90 days. Importantly, while a prior infection offers some protection from future illness, sometimes called “natural immunity,” the level of protection acquired from having COVID-19 may vary depending on how mild or severe the illness was, the time since infection and age, and no currently available test can reliably determine whether a prior infection provides adequate protection against reinfection. Accordingly, CDC recommendations provide that individuals who have a prior history of COVID-19 infection should be vaccinated following recovery from the COVID illness and satisfaction of isolation recommendation.”