Us saying Naruto can use omnyudon is the equivalent of you faps claiming sasuke can use all rinnegan six path abilities. The fact is sasuke only showed two of the six path abilities and ameno, do we discredit him when the faps claim he can use asura path or outer path? No, because he most likely can.
Naruto's RSM grants him universal comprehension, he already used yin/yang release to restore kakashi's eye. Why wouldn't he be able to utilize yin/yang release with his gudodama for omnyudon? Its stated the user can manipulate gudodama for a variety of elemental effects,weapons/shields,shapes,etc.