Look at his eyes. Naruto eyes determines if he's using RSM mode. If he doesn't have the dark pigmentation around his eyes then he's using RSM. The databook confirmed that.
The databook confirmed this Naruto -
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- and this Naruto -
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- were both in RSM. That mean this Naruto -
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- is using RSM. He is just using the 9 tails cloak with it instead of his full power. Why? Because Naruto eyes determines if he's using RSM mode. Since he didn't have the dark pigmentation around his eyes that means he was using RSM.
Naruto's toad sage mode still has the dark pigmentaion around the eyes in the gaiden -
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- That's important because it lets us reads know his toad sage mode still has a different appearance than his RSM.