I enjoyed the first video and found it refreshing for someone to differentiate SWP and VRS but he lost me when he started talking about the tips stalling during VRS.
My understanding is it's the centre of the disk that stalls and propergates outward whereas the tips are at very low angles of attacks due to blade washout and increased tip vorticies increasing induced airflow as well as the amount of the blade tips exposed to it.
Perhaps I'm hopelessly wrong but its logical to me and explained well in Wagtendonk.