The abolish/disband faction is a different faction from the defund faction, sharing with the other that both believe the reform cycle where police problems are dealt woth by increasing budgets for retraining or other reform measures, reducing resources for other services, which results in police roles expanding, resulting in new police problems from inserting armed law enforcement into nee and inappropriate roles needs to be broken.
The “defund” crowd says, lets wind that the other way and drive non-core roles and the funding to go with them to agencies outside of the police departments, so that the police department is focussed on roles that require armed law enforcement.
The “disband/abolish” crowd says lets go further, and redesign community services without an all-encompassing centralized paramilitary law enforcement service, with enforcement arms where necessary within agencies with focuses other than “law enforcement”.
(There's a fringe within the disband/abolish faction that would eliminate armed law enforcement as a local government function entirely, but they aren't typical of the disband/abolish movement much less the defund movement or an umbrella including both defund and disband/abolish.)