if you are lagging, you will die.
Not necessarily. We've had people completely lag out for several seconds while jumping around to the point that they fall to the bottom and then they just spawn back to the start point alive. We have other people with no lag issues who will die.
The inconsistency is the problem. If it were as simple as the laggy people are dying from the game using auto-stuck it would make sense. People with terrible lag don't necessarily die from this and people with no lag do.