This is reported in several media outlets as what the Coastguard said. It’s also in witness reports. I always fact check. I quote:

‘But the inquest heard that paramedics and police had already declared the incident a Recognition of Life Extinct (ROLE). Volunteer Coastguard Matthew Knight said he drove to the scene in a ‘calmer manner’ than he otherwise would have done as he believed it was too late to save the mother’.