Smells fishy to me. Could I see it happen sometime after the season? Unfortunate, but yeah. While we're still in playoff race? Not a chance.
Edit: after a quick check, this would carry more weight if there was more than one source. All articles I've seen lead back to dreger.
First thing that popped in my head was the timing. Detroit in a must win game tonight against Dallas, if Dallas players and coaching staff think they have a new GM ready to roll in town in a couple weeks, it may be in their heads and lose focus; advantage Detroit.
This might be a "leak" from someone wanting a win for Detroit tonight, in this must.win.game! Nill already turned a job down last summer because his kids were still in school and his wife was ill. I think his kids are still in school, and his wife gets the best possible treatment for her cancer in Michigan.