Remember in the S76 you don't have a 30 minute MGB run dry capability.
Yup, I totally agree.
In any case, anyone who thinks you can "run dry" a helicopter gearbox for any significant length of time is an idiot - regardless of what the manufacturer says.
On the 61 we had "emergency lube" but that was NOT run dry, it just lubed the inputs and bought you some time.
P&W experimented with a "paraffin lube" thing for the combining gearbox on the Twinpac in F/W but again, that was not run dry is was more like the 61 emerg lube system.
Finally, I am not speculating on what happened in this incident either. I will say there were no serious injuries so good on Captain Jayeola
and her crew.