Hi guys,
I am currently training my game by watching RIO videos. And i came across this diapo.

This is not the first time i see this and I can't seems to find the logic behind this calculation. Why does it not includes equity of respectives ranges ? I understand that this calculation is very theoretical but i can't understand it.
My question apply also to situation on the flop when vs a 1/3 bet we say that we need to defend 25% of the time. Can someone enlighten me ?