That’s incorrect. For the variant it was designed for, Pfizer blocks 94% of asymptomatic infections and 97% of symptomatic infections. https://www.cnbc.com/2021/03/11/pfizer-covid-vaccine-blocks-94percent-of-asymptomatic-infections-and-97percent-of-symptomatic-cases-in-israeli-study.html
There’s conflicting data about how effective the vaccines are at blocking infections in the Delta variant, with estimates anywhere from 39% to 90%. But it’s still blocking a certain level of infections despite the fact that the Delta variant includes structural changes in the protein targeted by the vaccines which render previous antibodies less effective. This is also a problem for people previously infected with COVID-19. Roughly 1 in 6,000 who already had COVID-19 are getting infected with the Delta variant. Thankfully, most of those infections appear to be milder than the first round those people had.
Is it technically a vaccine tho?