Apartments by Marriott Bonvoy is a new, separate brand. The first paragraph at this link is:

"Marriott International has been in the serviced apartment business for 25+ years with the Marriott Executive Apartments brand. Our experience managing and operating Marriott Executive Apartments internationally taught us a lot about our guests and their evolving preferences. Building off those learnings, Marriott International is excited to announce the launch of Apartments by Marriott Bonvoy, a new opportunity for Marriott owners and franchisees."