Dude,first of all,the links you are posting don't work,sencond,you are right,my god,if you search the name of the videos on the search tab you'll eventually find where he talked (TED)and what he talked about
But still,here you go:
The next outbreak? We're not ready | Bill Gates
https://www.ted.com/talks/bill_gates_the...discussion
How must we respond to the coronavirus pandemic | Bill Gates
https://www.ted.com/talks/bill_gates_how...s_pandemic
There should be videos on those links