It appears to be a job well done, and a sensible use of resources to me.
From what you can glean from the report, there was nothing especially hazardous about the way the task was conducted. The aircraft is fully capable of a Class 1/Group A Profile. The point of twin engine helicopters is to allow them to operate over hostile terrain and be able to cope with a single engine failure.
Even if you accept the CAA insertion into the PAOM about not operating in the low hover above water is reasonable (which I do not, but lets not go there), this does not appear to be one of those cases anyway.
So where is the potential problem, and the risk to life of the crew or aircraft from doing what they did, Viking?