Lack of argument against other points? I addressed all your points.
It can't because it was stated to absorb chakra. Not Natural Energy.
Naruto clearly stated he was absorbing his Sage Chakra.
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Says it again.
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He enters Sage Mode by gathering Natural Energy and fusing it with his Chakra (S.ENergy and P.Energy)
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Preta eats it and turns to stone.
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-You can't absorb Natural Energy and expect it to stay in your body in raw form. As soon as it enters his body it mixes with his chakra, creating Senjutsu chakra, which is then absorbed by Preta.
-If what you're saying was even possible, Naruto wouldn't have entered Sage Mode (You can see the pigmentation around his eyes appear and then fade) as he wouldn't have produced Senjutsu chakra, he would have just had raw Nature Energy.