Given the number of countries and institutions involved the scope of the conspiracy here would have to be vast. And there are plenty of powerful, vaccine-skeptical institutions (like the GOP) that would welcome this kind of data and venerate someone producing it. Indeed, some have already built media or political careers on COVID vaccine skepticism.

In addition, there's the J&J vaccine which was pulled after nasty side effects were found in a small number of patients. Where was the "they" who are supposedly creating the echo chamber in that case?

You're still making bold yet vague claims and providing no evidence. Just wishy-washy "an unnamed expert I know made this significant yet unverifiable statement".