This accident mirrors exactly a crash suffered by my youngest daughter who was hit by a car driven by an elderly lady who mistook her pedals.
As my daughter drove past a Co-Op car park, the lady mistook her accelerator for her brake and shot down the inclining car park into the road, hitting and writing off a passing van before bouncing off and hitting my daughter's car, causing repairable damage, and non-repairable distress and worry.
Fortunately, the incident was witnessed by an off-duty police officer, so the driver was successfully prosecuted and her licence was revoked.
It does highlight the need for older drivers to be re-tested regularly, far too many of them are driving past an age where they are a danger to themselves, and others.