I think you nailed it with this comment. It’s not always the case that people who go see a new or different line-up do so without knowing the difference or b/c they don’t care. In fact, I bet most fans are aware it’s not the same. Sometimes there’s just isn’t a choice if a fan wants to hear the music, despite the absence of some of the original/key members.
So this article is hinting there may be a new album from this line-up. Maybe it’s just speculation.
“What You Need To Know About Tickets To The Fleetwood Mac Tour”, Forbes, May 6, 2018
As an aside, the comments complaining about how Neil Finn is being characterized (or perceived to be characterized) are quite ironic given some of the things said about Vince Gill.