Interestingly the article describes a stamp with even one short perf as can be a space filler; HOWEVER, there is zero, as in no, mention of a reperforated stamp on one or more sides as being a space filler.
Philatelic attitudes gives the word "diversity" a much worse name than it has as a politically correct exclusionary term as widely used today when it comes to discussing who is "in," who is "out," and which ideas are better, worse or need to just be be cancelled.
