I'm sure they're pulling a bunch of IBUs from whirlpool.
That was my reaction, except that the recipe said to add the FO hops and 'chill as quickly as possible'. Regardless, I'd bet they're picking up IBUs in whirlpool. It'd be easy enough to hop stand those Ahtanum additions, though.
I thought the same, till I noticed that was the "beginner" version of the recipe. The advanced leaves a lot of the recipe formulation and technique up to the brewer.
EDIT: And thinking back to my early days, 'chill as quickly as possible' could've very well meant a 45 minute hop stand!