Lindsey was so awful to work with that Stevie asked him to do a song on IYD.
I doubt working with Lindsey has anything to do with Stevie being noncommittal with recording a new album. I think Stevie doesn't see the value in putting any effort into making a new meaningful Fleetwood Mac album because it won't sell. Yeah, her last album didn't sell very well, but it wasn't a serious project and it required minimal effort.