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This is my concern. This could end up generating great swathes of code that no one understands, so that when it breaks it takes much longer to fix.

I agree, I feel like it might be useful for whichever programmers regularly have to search Stackoverflow and then copy paste code snippets.

Then I feel like useful code produced by this tool will have to be treated in the exact same way as a rigorous code review: going through every part of the logic and ensuring it is correct. This seems like just as much or even more work than writing it yourself (if it is written in an unfamiliar way, you might need more time to wrap your head around it).

It's solving 'mechanical' problem. The optimistic twist on this helper is that it just raises the bar - human programmer should better be more useful than 'brainless' code generator - meaning not only being able to write a loop or solve leetcode task, but also understand context and what he's trying to solve for.

As you say typing code is not a bottleneck for problem solving

This is a very good point.