No that`s not what they`re saying, it`s not recomended and not supported.
You`ve 2 differend images, one that`s based on openpli and one that`s based on the original firmware from VuPlus.
Vix, Pod, Aaf and BlackPole are based on OpenPli
Vti and BlackHole are based on VuPlus.
This is only based on your examples.