^everyone should read all the purifi blog and papers and tech notes if not already familiar with driver distortion mechanisms
Or any other resources, there ought to be plenty, its just easily accessible and very recent material so a fine resource, although a business website.
Driver electrical and mechanical parameters change with cone position and basically sound of whole pass band suffers the more there is excursion. Excursion is due to physics, volume displacement needs to 4x for every octave of bandwidth (down) with flat power response. Some drivers have motors and suspension that makes less difference, some more. Imagination to play, think time slowed down, loud 50Hz component keeps the cone say 5mm off center which can make different inductance compared to rest position for example, perhaps change in Sd if part of surround is not moving as being stretched. Now for example 500Hz component plays quite many cycles while the cone is at this extreme position, or between extreme positions. Basically the low frequencies keep the cone in move and all the high bandwidth output depends on what the low frequency content is, non-linear distortion.
Basically any particular driver can play louder before audible distortion the higher it is high passed and excursion reduced. Simple stuff in the end for loudspeaker system design perspective. Its good to know there are good drivers available, that can have quite dramatic excursion before bad sound, if a system needs to rely on high excursion. What is not obvious though how much distortion is audible and what is good enough for each listener and application.