You made a really solid point about the lack of credibility from the BlueSky account. BlueSky isn't credible and an account with 12 followers is even less so. The claim about vaccine deaths isn’t backed up by data either. There is more evidence showing how vaccines have saved millions of lives, and how masks reduced the chances of getting COVID-19 by over 50%, than evidence claiming the opposite.
The CDC has solid info to back all this up, and it's a trusted source.