Finding
Yes. Installation, connection and technical operation establish that a component works; they do not establish that the intended person can reliably achieve the intended outcome.
How the mechanism works
The human outcome usually depends on a pathway across devices, accounts, interfaces, connectivity, physical conditions and sometimes other authorised operators. Any required transition can remove the outcome while the main device remains healthy.
Evidence boundary
This principle identifies a possibility and an assessment gap. It does not establish why a particular system failed.