That is actually the most honest fact sheet I've seen for these covid therapeutics.

REGEN-COV is investigational because it is still being studied. There is limited information known about the safety and effectiveness of using REGEN-COV to treat people with COVID-19 or to prevent COVID-19 in people who are at high risk of being exposed to someone who is infected with SARS-CoV-2.

Also of note, it isn't claiming to be a vaccine

REGEN-COV is not authorized for pre-exposure prophylaxis for prevention of COVID-19. The FDA has authorized the emergency use of REGEN-COV for the treatment of COVID-19 and the post-exposure prevention of COVID-19 under an Emergency Use Authorization (EUA).