Another good catch. Mvp-1 is the oldest and most original signal, based on high multi-day spikes in vix and cpce.
mvp-2 is newer, though several years old, and is designed to generate the same style buy in situations where vix and/or cpce are skewed (abnormal readings, large range shift)
It relies on other indicators to make its decision.
Both are 'buy as late in day as possible' signals, which also means cover any existing short as late in day as possible.
The late in day aspect, over 10 years, has provided better pricing. It will not be perfect every time, every year, but works best over the long run.