It’d only take an hour if you reviewed a million lines per hour

Even before AI, deterministic checks by compilers are almost always better than "review the code"

"review the code" as a solution will eventually fail and cause a problem, even pre-AI.

even when you can review the code, it's good to have the compiler check for you. This is for similar reasons why it's better to have CI check correctness on each code change, vs testing the code thoroughly one time, and then being careful going forward.