This false claim was made by the CDC Director:
The CDC subsequently (like right away) tried to distance itself from that claim: Backlash and reversal after CDC director says vaccinated people cannot spread COVID-19 | National Post
Somewhere – but cannot find it at the moment – I think an FOIA on CDC emails showed she should have known this was not true as internal emails well before this presentation indicated they knew the vaccine did not prevent disease spread.
If you do not know the answer, or are unsure of the answer’s reliability, it is best to be truthful – rather than operate as a salesperson pushing through an agenda. She was in sales pitch mode – working to force the vaccines on everyone.
And there’s more:
https://twitter.com/VigilantFox/status/1891690382779470104
