Except the depletion workouts. Every good program has progression, so to say UD2.0 follows HST principles goes without saying on that front.
Mass variant is gonna be fun. I cannot wait.
No SD, and the rep ranges are done differently. 12-15 Monday/Tuesday, Thursday is 6-12, Saturday is 3-6. Rather than across a cycle with 2 week blocks, you go through it all in a week. I like that approach more, to be honest. It's not as boring to me.
And the depletion work is significant - that's what makes it UD2.0, to me. Without it, and the supercompensation, you won't make the progress you normally would. With the mass version, it helps stop fat gain. Keeps you lean, gets you HYOOGE! Lol.