I haven't heard of this fad yet.
Stance width for each person is going to vary for each person's dimensions, board, and ride style. There are considerations to the width of stance. Typically a narrower stance is used by riders that race, and is coupled with a forward stance. A wider stance is typically used by jibbers with a duck stance because it lowers the center of mass and provides for better stability. There is some truth that narrowing the stance can allow for faster rotations much like when a figure skater balls up or draws their body in close. It does come with the penalty of a higher center of balance. Like anything to much or to little of something will have different pros and cons.