Honestly, I can think of two things.
1) They're bad, looking for smart people to grind them down with 70-80 hour workweeks, with no end in sight, with the illusion of small stock grants that will be diluted a few more times before IPO.
2) They just needed a short title for the job posting (HN limits titles to 80 characters), and they tried to summarize the fact that they look for people who are motivated, willing to work hard. But it doesn't say much about their attitude, their desire to exploit workers, vs simply trying to find good hires to add value to the company.
I don't know if it's #1 or #2, or a #3 that I can't think of right now.
A wise prospect employee will do the homework to understand what's the company culture, what's the cap table situation, etc. There are plenty of resources to get a better sense of whether it's a good idea to work for a company or not.