An expert opinion based on knowledge of virology and the impact of the vaccine on symptoms that lead to transmission is "making things up" much in the same way the Manhattan project "made up" nuclear weapons.

While the vaccines do not eliminate all transmission, they can help. Studies done after distribution of the COVID-19 vaccines began, including research by Pfizer, did find that the company’s shot reduced asymptomatic infections in addition to symptomatic cases with earlier variants of the virus. Researchers in the United Kingdom reported in a February observational study that Pfizer’s vaccine helped cut transmission of the alpha and delta variants.

https://apnews.com/article/fact-check-pfizer-transmission-eu...