Fundamentally, the report is not well written and a diagram would have helped enormously as would a more precise description of the dimensions.
Looking at the pad on Google Earth and using the history function, there are photos of the different aircraft (that the pad was designed for) but also one with a -58 on pad 1 - with a simple measurement of the rotor, you can see that even with the diagonal offset of pad 1 to 2, there is more than adequate clearance with 2 helos there - but clearly not the mandated minimum of 1/3 rotor.
It is possible that the measurement of 33 ft is edge to edge, ignoring the diagonal offset which would give a bigger safety margin but not by much.
The PD seemed to have ignored the reduced safety margin from introducing new helos and not even bothered to repaint the pads - perhaps the main contributory reason for the accident was an underlying laissez-faire attitude to safety - the classic 'we've done it this way for years and never had a problem'!
At least it is all sorted now and the fickle finger of youtube fame can 'having writ, move on'.