I would presume it saying "the power brick is defective" is a really, really good specification about what the exact problem is with regard to a "safety issue." TechCrunch also labels it as "USB Charger" (which makes me think of just a regular USB cable) when in the email it says the "USB charger brick." What I REALLY hate is that TC never, ever goes back and fixes grammatical errors/typos/misleading statements when it screws up an article, it just adds an "update" at the bottom of the article. Have they not heard of TL;DR?
At least the notice email was well written.