I recalled once seeing something to the contrary, i.e., referring to the area and it has bugged me since.
I find alt process printers refer to the increase in area much more often than linear enlargement scale as you have to measure your coating solutions by area covered, i.e. an 8" x 10" print takes 4x the solution a 4" x 5" print takes. Maybe the person who referred to area also does alt printing.
Let's see what I've got in the magic trash can for Mateo!