That's for people outside the Scrum team, meaning that no external stakeholder may manipulate the backlog by bypassing the POs. Internally the team must act as

That's for people outside the Scrum team, meaning that no external stakeholder may manipulate the backlog by bypassing the POs. Internally the team must act as a cohesive unit, which means that a Scrum dev should have the same objectives as a PO, with regards to both priorities and goals. That may mean adding items in the backlog pertaining to technical debt, and so forth