Not familiar with the S76 C models so not sure if they have a certified Cat A elevated helipad profile but if not then there you have it - you can't operate in a congested area to elevated pads where an engine failure would put the aircraft and it's crew/pax plus those on the ground in danger.
If TC have been sued in the past for inadequate oversight of the regs then you can understand them behaving in this way. Would you want to be the inspector sitting in the dock after you cut the operator a bit of slack because they are doing a worthwhile job?
G.