That's from the clinical trials, which are like two variants behind what people are actually being exposed to in the wild right now. The vaccines are much less effective at preventing people from catching and spreading the currently-circulating Delta variant than the original one which those numbers were based on. Firstly, they don't stop people from catching the virus nearly as well, and secondly vaccinated people who do catch the virus seem to have comparable viral load and spread it just as well as the unvaccinated. Also, the Delta variant is just better at spreading in general, which itself means a more effective vaccine would be needed in order to prevent everyone from inevitably catching it.