Crew member Ali Vatter (backstage/catering coördinator? I'm not 100% sure of her job description) sorta kinda confirms this was their last tour:
https://www.instagram.com/p/B5UgyBnlNC8/
"Fleetwood Mac Fall US/CAN 2019. Sad to say this could very well be the last pictures from a Fleetwood Mac tour. It’s been a crazy ride since 2013. I have changed a lot, made life long friends, and am grateful to have been able to tour with such a rad band."