It's always a warning flag to me when an article like this says MAY contribute...
To me that means, "We can't prove anything but we think it's possible".
Unfortunately, most folks read an article like this and take it as gospel. Then, even after a real study disproves the original statement, people will continue to use it as a guide to their eating habits, "just to be safe." It's an extension of the "When in doubt, throw it out" philosophy.
"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan