The Steamworks documentation explicitly states that keys can be given to supporters of crowdfunding campaigns provided the Steamworks Distribution Agreement has been signed by a relevant party. The only greyish area is beta (i.e. pre-release access) keys.
Edit: Not to mention Phoenix Point dev Snapshot, another crowdfunded game that was snapped up by Epic, has confirmed in no uncertain terms that Steam/GOG keys will be provided after a year. Simply put: There are no "negotiations" as there's nothing to negotiate. Naturally, that does raise the question of "Then why is YsNet claiming otherwise and casting doubt on the possibility of Steam keys?", and the answer to that lies in the chief reason why Epic snaps up popular crowdfunded games: to buy backers. The games themselves are just the cherry on top; what Epic is really interested in is quickly and easily securing more users.
Exactly. I don't see what's to negotiate here. Sure, getting Steam keys isn't an automatic process anymore due to abuse. But to talk about negotiation ? They're no small indie dev. They're a AA publisher with tons of games on Steam. That DS would need to negotiate steam keys is a laughable idea.