The statement about 99 out of 100 cyclists "tucking back in" i.e. moving back to the edge, to allow motorists to pass. While the statement itself may be true as most cyclists probably do that, I do not agree with riding in that manner. If the lane is too narrow to share, it's too narrow to share, and cyclists shouldn't be weaving back and forth between an edge position and primary position. I keep primary position by default, and hold a straight line, UNLESS the lane widens and I can safely move farther right to allow cars to pass in the same lane, or a wide shoulder opens up or whatever. Otherwise if the lane is narrow motorists must change lanes to pass.