Its a Yin Yang Release jutsu. Nothing ever implied Hagoromo could only use it directly because of the Rinnegan. Most likely it was his mastery over Yin and Yang, which could have been due to the Rinnegan.
ι was wondering if creation of all thingz ωαѕ a jutsu then BZ and BIJUUS (1-9) tails ωєяє created from a jutsu or rather what should COAT (creation of all thingz) Be classified as? And what is jutsu?