Enough humans that desire that outcome? Oh yes, there are.

Enough humans that desire that outcome and can be trusted not to leak? That's the impossible.

WHO and WEF lack the coercive powers of a State to clean up after leakers, so as institutions they couldn't possibly be involved.

Smaller collusive networks, or national governments, possibly including some WHO/WEF personnel? Entirely too possible.

But I agree, anyone positing either of those institutions are planning another global pandemic as institutions is unlikely to be correct.