Because it's a good game.
If they somehow manage not to get on Steam, they probably won't follow through with releasing it on PC. Plus it's not mentioned anywhere that this will be a Steam exclusive. It might start out as one to maximize initial profit, many games do.
Note that only this is mentioned about Steam:
"And exclusive to the Steam version, earn achievements and collect Steam Trading Cards – complete the whole set before the Raincoat Killer gets you! ". In every other part it's referred to just the PC version.
It being a good game doesn't mean I want it to be on Steam. I'm indifferent to it being on Steam, the only thing I'm interested in is seeing it get a DRM-free release. So I'll vote for it (to help them out) if they can announce some other release.
If they didn't get onto Steam immediately, why would they drop all plans for the PC release? Makes more sense to carry on and release it elsewhere in order to build hype to get it through greenlight.
That wording does sound promising, but I'm not going to read into it too much.
You got some weird priorities. I understand why people might not like Steam, but when shit like this goes above getting a good game it just stops making sense.
I guess I wrote that thing about not getting Steam and stopping development rather pointlessly, it's definitely gonna get on Steam.
Anyway, I saw you in that thread on steam community forums, so you know other distribution methods have not been discarded and it hasn't been completely tied to Steam. I think that guarantees at least an attempt to talk to other distributors to try and work out a deal.