Helldivers on how many people linked their accounts to PSN: Sorry. I don't have the stats on hand... And I don't think I'm allowed to give details. But a significant amount.
Yeah, probably not an NDA, more like a complicated contact where he agrees not to disclose certain things. Well, maybe not a contact specifically, just an agreement. To not disclose... You know...
Speaking candidly about business negotiations can harm a good working relationship if you say the wrong thing. You also don't want to say anything that could be perceived as badmouthing the people that hold the keys to your success. He's likely just trying to be careful while being as transparent as possible.