The Hollywood Reporter just announced that Starz has in fact cancelled Ash vs Evil Dead.
Bruce Campbell released the following statement:
“Ash vs. Evil Dead has been the ride of a lifetime. Ash Williams was the role of a lifetime. It was an honor to reunite with Evil Dead partners Rob Tapert and Sam Raimi to give our tireless fans another taste of the outrageous horror/comedy they demanded. I will always be grateful to Starz for the opportunity to revisit the franchise that launched our careers.”
The final two episodes air this Sunday and the following Sunday respectively at 9 pm EST on Starz.
Source: https://www.hollywoodreporter.com/live-feed/ash-evil-dead-canceled-at-starz-1104557