He is not saying the reference spoke about safety stops. He is trying to extrapolate deco theory into safety stops. His point is that the static safety stop (15' give or take 5') is not always ideal. You would surface with less nitrogen saturation if you maximized your M factor (maximum super saturation) in order to maximize off gassing.
That being said. For a recr recreational dive, doing deeper stops, you would be ongassing your slow compartments and offgassing your fast compartments which would end up needing more time at a shallow depth to off gas and would not be ideal
That being said. For a recr recreational dive, doing deeper stops, you would be ongassing your slow compartments and offgassing your fast compartments which would end up needing more time at a shallow depth to off gas and would not be ideal