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Hagoromo is manipulating that level of Chakra, if not more, in both activating the Jutsu (Which is not possible by in-verse rules unless he is able to produce and control said chakra) as well as portioning his Chakra between Naruto and Sasuke.When have they ever shown the capacity to amp their stats to the same level as the Six Paths Chibaku Tensei?
Sasuke by the end of the war is stated by Kurama to have the same skill level in manipulating Chakra like Hagoromo.
Therefore, Chakra Control dictates they can use said Chakra to amplify their stats. To suggest they can’t is to suggest they aren’t able to manipulate that volume of Chakra, which isn’t the case, and Ninja are shown amping themselves consistently throughout the series since Part 1. They do it all the time using Shunshin even as an example.