The last part of the first video makes it more clear: you're basically your own bass backing player with one or two notes. I see why he trademarked "palmbass" as another term.
which is exactly the role of the thumb in classical guitar
so this is solving the fact that using a guitar pick forces you not to use your thumb
which is exactly the role of the thumb in classical guitar
so this is solving the fact that using a guitar pick forces you not to use your thumb