Without knowing everything Lancs knew-if a person is reported missing; their dog and phone are found near the water; a check of police systems show police attended a welfare/mental health job a short time before…she’s graded high risk.
If she’d been reported missing in for example a shopping arcade with the same information re her mental state, she may have been graded medium risk.
It’s really semantics, we aren’t privy to everything. I can only speak from decades of experience. I can also seriously question how Faulding wasn’t aware she was high risk. He sounds like he was simply covering his arse after over promising.
I'd say anyone suffering mental health problems would be graded high risk irrespective of where they went missing. Her last known.location, the phone and dog would just have added an extra sense of urgency.
The police never refuted his claims he wasn't informed she was high risk. Sadly it wouldn't have changed the outcome but it's possible it would have been concluded earlier.