That’s a huge overstatement. If that were true, then banks would code their core financial services with that approach but they don’t.

Is it though? I see this occurring every day in a number of projects I have visibility to.

Isn't this exactly why OS projects are over-burdened by the firehose of contributions? The maintainers will want to read the code contributions, while those up-to-date with the latest models/agents/tools already trust their output to be above the average developer's (whatever that means in practice).