Well let's see..... I have the the everything and platinum packages and when I go to DishOnline I see all the channels available and for those channels that you need a subscription to, they show "unlocked" in green in the upper left hand corner of the item you would like to watch. I have to assume that, if they are not available to you, you would see a red "locked" in the same area.
Now, how helpful were you when you asked the question. You didn't mention that you have already looked. You only asked if you could watch EPIX with an Absolute subscription.
If it's locked, you can't watch it, if it's not, you can... It's that simple.