I was using
https://www.iatatravelcentre.com/world.php (which is linked from
https://www.iata.org/en/youandiata/travelers/health/)
Very confusing as Peru's US embassy website was updated recently and only mentions the PCR testing (removed the antigen) as well.
I'll prob get the PCR test anyways at this point since airlines and peru aren't known for being super on top of these changes.