I think a few people have the wrong idea about what the employer was trying to do here.
Correct me if I’m wrong, but I believe it was a simple test for each potential candidate to take. It wasn’t a page that needed fixing, nor was it them trying to get work done for free, it was simply a test to see the skills/capabilities of the people applying for the job.
Having said that, I do agree that it’s so far beyond repair I wouldn’t even bother. Unless it’s something tricky like just an extra } in the CSS markup. Sneaky sneaky.
Yes, many corporations give their candidates tests like these to see how the designer identifies and tries to resolve the problem.