The number of lines you have to review at once doesn't matter.
Vibe coding is letting AI write code so you spend less time writing the same amount of code (ideally not more, in practice definitely more).
If more code is written you have to review more code. Doesn't matter if you break it down in 10 lines PRs or if you review a million lines at once, you still end up having to review all the code generated.
Is this a 1-person dev team? Because on teams, one person has to submit a PR and then someone else on the team has to code review it, right? So then you're doubling the review time of the code. If you wrote the code yourself, you would already know that it works, then you submit the PR, and then someone else reviews the code one time, not twice. And typically reading and understanding code you did not write takes longer than writing the code yourself. It does not seem like "AI" coding is really saving anyone any time, and is probably wasting more time than it saves.
But you can't change the fundamental operation of an LLM, by its very nature it is not suitable for producing consistently correct results. Getting better at "vibe coding" is an exercise in futility.