Who's word? What is your source that says the road is to remained closed? Info came from the Yolo Road Dept. on Friday; please PM me if you'd like the employee's name. I've got a call out to someone at the Blue Ribbon Coalition regarding some questions I have about the change and will report back when I have more info.
That first link for Yolo County only says that Rieff Road (CR40) is closed seasonally, which mimics previous experiences. There's a link at the top of the page to "Subscribe to receive e-mail updates" on road closures, which may be helpful in following what's going on with Rayhouse Road/CR 40 and the rest of the county.
The Lake County link doesn't mention Rayhouse Road (the name of the section within Lake County) at all. It's a resource for info on Lake County road closures, since the western end/Reiff Road is located there. Sorry for the confusion.