I know this is the pedantic (and correct) response, but the idea of pixel "doubling", in this sense, is a doubling of height/width, even though you get quadrupl

I know this is the pedantic (and correct) response, but the idea of pixel "doubling", in this sense, is a doubling of height/width, even though you get quadruple the area. The general public, being not super-duper mathcores, understand this concept as "pixel doubling", for better or for worse.