Even the idea of having to use credits to (maybe?) fix some of these errors seems insulting to me. If something like this had been created by a human, the customer would be eligible for a refund.
Yet, under Aron Peterson's LinkedIn posts about these video clips, you can find the usual comments about him being "a Luddite", being "in denial" etc.
At the very least, many of them were probably unable to differentiate between "coding problems that have been solved a million times and are therefore in the training data" and "coding problems that are specific to a particular situation". I'm not a software developer myself, but that's my best guess.