Earlier quoted context omitted.
Bill Gates is a public health expert. He has been working on these problems with some of the smartest minds in the field for decades now. How long does someone need to be working on a problem before they're worthy of being a "go to source", in your opinion?
Well anyone who has extensively published novel research that has altered best practise in the field for the better and has a track record of being sensible, well-reasoned, logical, has an understanding of how humans organise not just the natural world and has wonderful command of spoken and written expression would be near the top of the wish-list. It's not how long it took that person to demonstrate this. It's that…
Look at his prepandemic warnings of a pandemic and how it would play out. And real money and action in trying to prevent it. That's why he is being held up as an authority.