Atis says we are landing 18s.

"Cleared to descend via the xxxxx arrival north transition". Ok North Transition, we are heading north of the airport to land south right?

Nope, you should have turned to 067 and you are now super high. It was straight forward when the clearance altitude let you know which runway or that they had turned things around, 10,000 vs 12,000.

The description seems to be counter intuitive.

Very confusing when they are switching runways back and forth.