Exactly it is because I can not answer your question...

...no it is because your question showcase, that you lack very basic understanding. It is not made up, that for some concepts you have to learn the basics first.

Learn maby how universities proof the function of a vaccine. When you do not understand, how they do it, investigate until you understand it well. Or you think that some internet dudes are just the greatest genius humanity has seen, and know how to proof the function of a vaccine better then all universities in the world? The probability for me to win all euromillion lotterys of this year is probably still bigger, than some internet dude without any reputation having better methods for scientific proof, then all universities in the world.