To answer my own question: apparently it does only apply to routers with default passwords. From Ubiquiti’s forum…

community.ui.com/…/fd8b79c1-5d2f-43c7-a7fa-2c49c7…

community.ui.com/…/8fbff56e-baca-4633-9f43-8543c9…

community.ui.com/…/e419dbae-9c85-4fa4-b46b-bbdbd0…