Just because you read it on the internet does not make it untrue, either.
There is plenty of scientifically verifiable data to support the aerodynamic behaviour which has been outlined here. People may choose to believe what they wish, but it will not alter the actual fact of the mechanism at work with a winglet.
You may choose to ignore my opinion, it's no skin off my nose, but I'd suggest you consider carefully something when Keith or John state it. And you could easily look up Whitcomb's research if you were so minded.