Neither Biden nor Fauci spent 1 day in the hospital. Neither one even really stopped working. They took paxlovid because, at that point, it was proven to be effective in mitigating the severity of infection. You don't take chances with the most important person in the country even if they felt fine. If the president tested positive for the flu, he's still getting Tamiflu regardless of how mild his case might be.

Paxlovid is not and has never been an AIDS drug. It was developed for SARS-COV2 starting in 2020, partially based off an aborted attempt at a SARS antiviral from 2003. It went through a year and a half of development and trials before getting emergency authorization and it's very likely helped save many lives. A big part of the reason we have little to no concern as a society now is because of how effective Paxlovid and vaccines have been at keeping hospitals from being overwhelmed and deaths from spiking.