I don't want to get into a he says, she says, but Malone himself states he invented the vaccine. He didn't, he was one of a huge number of people involved in research. There's lots about his outlandish claim on the net, but this is the shortest, clearest piece
https://www.logically.ai/factchecks/library/3aa2eefd
There have been a tiny number of deaths associated with the AZ vaccine. That's absolutely awful, but sadly any medical intervention carries a risk - look at the side effects and contradications on the fact sheet in a paracetamol packet for example.
The fact remains that covid vaccinations have saved millions of lives around the world and it simply isn't true to say it doesn't work.