I do believe Naruto met the Sage because he had all 9 tailed beast chakra within him,
but I hope you mean RSM is a product of Rikudou Chakra by itself. It might form in that appearance thanks to the Kyuubi's chakra since it's similar to a cloak, but there is no hard evidence to Naruto using the tailed beast to form it, nor do the data book state otherwise. Naruto was only able to bring out their powers once obtaining the Rikudou Chakra, which makes sense because Hagoromo was the Jinchuriki of the Juubi, which in turn was split into nine different beings.
I just wanted to clarify with the readers of this thread:
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Not stating you were wrong or anything, unless you did mention that.