I have some coworker who says something similar, he vibe coded tons of cryptic code, which indeed solves some problem though could be way more compact and well structured. Now it is hitting complexity limitation, since llm now cant comprehend it, and human cant comprehend it by large a margin.
honest recommendation: nuke and pave after analyzing (w/ AI of course) where it went horribly wrong.
it's trivial to reimplement a better solution.
Just wait a month, Opus 4.8 will comprehend it for sure.