Sort of? The grouping isn't merely about organization or convenience. A
release group represents a real world thing. It says "all the releases in this group are versions of the same thing" (where usually that thing is an album).
On the other hand
My understanding (maybe I'm totally wrong) is that singles are a different sort of thing from albums. A remixed album is certainly a different album. Is a remixed single a different single? IMO, no.
I'm personally in favor of grouping singles liberally, and would have voted "yes" on this edit.