How many people have had these shots? What percentage of them have reported these extreme events after the shots? Which of the shots did they take?
How many people don't discover their bowel cancer until it gets large enough to cause obvious rectal bleeding? Or their lymphoma until they feel bad enough to get medical attention? Superfit people get heart attacks like the rest of us, they are not immortal - though any vaccination (like many other things) has a very slight risk of triggering anaphylaxis, (an acute allergic reaction - which may be to any of the ingredients, including non-medical ones, in the mixture) which could cause inflammation of the heart muscle
Don't forget that diseases can occur after some other event without being caused by that event, and that when we are struck down by a sudden illness, we at once start to wonder what caused it - and we remember anything unusual that happened just before it struck, like getting a vaccination. However, if we are diagnosed with gallstones the day after we buy a yellow car, we don't blame the colour of the car for our pain.
I would have thought that advanced bowel cancer would have taken a while to reach that stage,