While this theory of Gojo's Red attack chant foreshadowing Sukuna's demise could be a fun analysis within the Jujutsu Kaisen community, it is likely that this isn't the case.

Gojo vs. Sukuna reaches unimaginable heights in Jujutsu Kaisen manga chapter 229. ... Unfazed, Gojo employs his Red technique in an attempt to subdue Mahoraga. To his astonishment, ...