It doesn’t follow. Everyone sane has the models review the choose the models wrote. Reminder these are the models which found the Jacobian and Navier-Stokes counterexamples; they’ll find holes in their own slop, too.
Also I find calling millennium problem solutions ‘straightforward’ baffling, to be polite.
Furthermore, you need to make sure the model you use is capable enough to review your code comprehensively enough. That includes for both basic vulnerabilities but also attack chain related vulnerabilities.
It's not enough, though, to just tell the model to check the code for vulnerabilities. The model has to be guided specifically to look for particular classes of problem and that takes someone experienced in security.
That makes the bot more effective, but isn't strictly necessary. If you have a harness that can track longer projects it can do all that by itself, it needs your wallet, not your thoughts.