That's a misleading thread title. As a Variety article explains, Disney+ will not be funding new episodes of the main show, but they're a partner in a spinoff:
“We’d like to thank Disney+ for being terrific global partners and collaborators over the past two seasons, and for the upcoming ‘The War Between the Land and the Sea,'” Lindsay Salt, director of drama at the BBC, said in a statement...“The War Between the Land and the Sea,” a “Doctor Who” spinoff starring Russell Tovey and Gugu Mbatha-Raw, is due on Disney+ as well as BBC One and BBC iPlayer later this year.