Probably not a success from their point of view but from my point of view it's a great ad. It convinced me immediately not to waste any time pursuing the opportunity.
In addition, I can say that the only reason I'd care to know who the stealth company is is so I can avoid giving any thought to working for/with them later on or reading any later (probably toned down) job postings.
In addition, I can say that the only reason I'd care to know who the stealth company is is so I can avoid giving any thought to working for/with them later on or reading any later (probably toned down) job postings.