Once again, it was a Genjutsu. There's nothing like "Senjutsu enhanced it" when we saw from the start that Senjutsu wasn't used. It's either the Genjutsu was first used here
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or here
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and Senjutsu wasn't used while it was shown. Not at all...it was only shown
while in the Genjutsu..So there's nothing at all indicating that it was Senjutsu enhanced.
Oro says "This is" and next, Sasuke says the same thing Itachi said when he put Oro in a Genjutsu...Notice how Oro only notes that when he sees the Senjutsu blackness eroding which indicates that it was indeed in the Genjutsu
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..Not to mention, if Senjutsu was used to enhance it, I don't know why Sasuke won't be in his CM state.