It has to do with the beer styles, and the categories they fall into.
For an American amber:
Vital Statistics: OG: 1.045 1.060
IBUs: 25 40 FG: 1.010 1.015
SRM: 10 17 ABV: 4.5 6.2%
So, it's a bit higher in OG and IBUs but the grainbill fits an American amber because of the crystal malt and the color. Many American reds/ambers are highly hopped.
For a pale ale, the color is usually lighter and the crystal/caramel malts more restrained but they can be even more highly hopped.
This is not even close to an IPA in color, flavor, or maltbill. An IPA tends to have a firm bittering, a drier finish, less sweet malt, and a more attenuative yeast.
Sure, there are hops in this beer but it's not anything like an IPA in those ways.