I have looked at the hanging hummer from as a close as 12 inches and also at
all my photos, and I don't see any red gorget. I can't see how this can be
an adult male. It continues to hang there while another hummer feeds, so it
is not guarding the feeder. Since the adult seemed to feed it, I conclude it
is a juvenile.
It is interesting that you found a source that has seen this hanging posture