Haha I'll believe it when I see it. Pretty sure he said something similar a couple of Stardew Valley updates ago. This seems to be his number one love and obsession and one of these days while working on Haunted Chocolatier again, he's gonna think "hmmm that would actually go nicely in Stardew Valley" and start working on SV again.
Just FYI I'm not complaining or anything. I think it's funny and relatable. But I'm not gonna hold my breath for this game until it's actually out.