On the other hand, Brody has known record of exaggeration and distortion of truth. Whereas Musk is an honest, no-nonsense engineer. (Although I'd be interested if you could point me to a situation where Musk was caught blatantly lying about something.)
If that is that case, Musk would have known about his alleged "agenda" before handing over the keys for the review and could have acted accordingly. But he didn't.
I don't think Musk has the time to do background checks on every media person who wants to test-drive a vehicle. And the supposedly credible reputation of NYTimes may also have led him to trust Broder. In his blog post however he admits that he made a mistake there.