I just wrote quite a long reply here to try to cover the key points - but not all of them were covered! There has been a significant debate over his role in the development of the technology and he was even removed from the Wikipedia page on mRNA vaccines after having been on there for years. It's true that he is not the lone inventor of what is in the shots today, but at the same time he was part of the process early on and clearly has a lot to say about it that is coming from a lifetime's experience.