"Infused with the chakra of the planet.. a new Rasengan harnessing that 'rotation.' The swirling force permeates the target's body, inflicting sustained damage until released by the user, Boruto, effectively causing semi-permanent harm."
This doesn't contradict the other statement where the Chakra of the Planet is equated to it's rotation.
which is why we mention it not being a good AP feat, because if we lowball it and say that its just solely using the KE of the planets spin then you get a Tier 5 that scales like 5 people with no room for back scaling. it would not be a good substitute for a hypothetical The Last downgrade.
I don't want it to be a substitute, it's just usable scaling wise.
I mean, it can be used to scale Kaguya and Momoshiki if presented with good enough arguments,
If we assume the Chakra of a planet is also composed of it's rotational energy, that would mean that a single Chakra Fruit would be baseline 51 Exatons.
The scaling would then go something like (assuming all other Moon stuff gets tanked):
Kaguya = Possibly 51 Exatons (Moon level) (Ate the Earth's Chakra Fruit, although we can note that the Earth still has natural energy so we can't really tell if she'd scale to the full value)
Momoshiki (Base) = 102 Exatons, possibly 153 Exatons (Moon level) (At at least 2 Chakra Fruit, possibly 3; We see him eating one in the novel and anime, we have that God Fruit on that dead planet where the fight we see happens, meaning that said planet was already devoured, and in the novel and anime scene he already has powers implying that he had already eaten one Chakra Fruit before. In the anime it's more than one God Tree.)
Momoshiki (Fused) = 204 Exatons, Possibly 306 Exatons (Moon level) (Scaling)
Naruto (Rasengan Barrage) = 408 Exatons, Possibly 612 Exatons (Moon level, possibly Small Planet level)
MAS = 612 Exatons, Possibly 918 Zettatons (Small Planet level)
EDIT: Forgot how MAS scaling works, fixed it