"Among other things, he has also misstated the contents of vaccines, falsely claimed there is convincing evidence that the 1918 influenza pandemic and HIV both originated with vaccine research, and repeatedly touted misinformation about Covid-19 vaccines. In 2021, for example, he baselessly claimed that there had been a wave of “suspicious” deaths among seniors who had taken these vaccines."
https://www.cnn.com/2023/07/21/politics/fact-check-rfk-not-anti-vax/index.html
But then he won't win so who cares?