They're only looking to be paid back if you reach profitability.
6% equity to get a $33k loan and some sort of training/advising for 13 weeks at their facility, and office space afterwards? Could be a good deal, especially if you have a new business that requires medium amounts of capital costs to get started. If you're getting something manufactured and your first run/prototyping/etc is going to run you $15k, it might be good to do that on their dime. If it works out and you get profitable, you pay them back and they've got their equity. If it fails, they're out the money.
Could be good, depending on your circumstance and the specific terms on it. I could see lots of cases where that'd add far more than 6% chance of success and value to the business.
Edit: Gosh, a lot of reply comments. To clarify:
-You should always, always read the terms carefully in any important contract you're going to sign, and strongly consider hiring a lawyer to give it a once-over.
-In this particular deal, you'd want to make sure the loan isn't personally guaranteed and what the terms of calling it are.
-I could see times where I'd be ecstatic to take this. Lots of brand new companies would have a much higher success chance and EV with 94% equity, $33k cash in the bank, and $33k in debt with flexible repayment terms than 100% equity, $0 cash, and $0 debt.
-Money's worth a lot, and people often underestimate how much it's worth. Especially for an unproven, speculative venture.
-It might or might not be a good deal depending on your specific circumstances, and the exact terms of the loan. Again, read contracts carefully and strongly consider hiring a lawyer to look it over.
-As always, consider not making flippant comments on Hacker News? It's kind of tiresome to get ignorant and flippant replies when you're trying to do a neutral, factual analysis.