Wow, that advice seems contradictory to reason. It may be that you are correct, but I would imagine that with the lock disengaged, the only thing supporting the force on the blade then is the hinge itself! I would also be concerned that, with the lock disengaged and the blade already less than aperture, that a hard blow could result in driving the blade out of the wood and snapping it shut under load. If fingers are wrapped around the handle in such an event, there is a real possibility of significant digital injury. Maybe not a high risk of occurence, but a dramatic outcome if it did.