I don't think it's "how about". A relevant reference from the answer you linked to would be:

What price? Said when the value of the thing referred to is being diminished or ignored.

The comment may be a bit jarring to modern sensibilities. Since this is a wartime (well, pre-war for the U.S.) propaganda film, I think it's intended to be denigrating towards Goebbels and implies that he copied some unpleasant techniques from the (presumed savage) aboriginal peoples of North America, so his value is less than one might think. These days both presumptions are just about reversed- aboriginal peoples are noble stewards of the environment and Goebbels' methods are studied by political operatives.

I don't think it's "how about". A relevant reference from the answer you linked to would be:

What price? Said when the value of the thing referred to is being diminished or ignored.

The comment may be a bit jarring to modern sensibilities. Since this is a wartime (well, pre-war for the U.S.) propaganda film, I think it's intended to be denigrating towards Goebbels and implies that he copied some unpleasant techniques from the (presumed savage) aboriginal peoples of North America, so his value is less than one might think. These days both presumptions are just about reversed- aboriginal peoples are noble stewards of the environment and Goebbels' methods are studied by political operatives.