Well, Digi_B must know who has bought the game. So either give them a Steam Key, or email them individually with a download link where they can download the next update. Now he has it on sale on Steam, he can't make it a free game, which gets around the Itch deal!
the only way digi_b can just give previous buyers a steam key is if that was negotiated with steam, prior to it being added. it's highly unlikely they'd accept the idea of "giving away" that many keys, right after steam launch. but, again, that's between digi_b and steam, and whatever they agreed to. and from what i read on the other page, making the game free wouldn't be enough for itch's new policy.
Well, all I know is, how can he give updates to us purchasers who would get them "free" on Itch, because we paid, when others who didn't buy it could also get them? It would need your order number entered first, or something, and I don't know if Itch can even do that!? It's quite a quandary! I wish I could remember which AVN, but there was definitely one that if you paid for it on Itch, you just needed to send the purchase receipt to the dev at a Gmail address, and he emailed a Steam key back. So it can be done.