Yes, EC120 has a forward CG issue....you cannot be in CG limits if loaded up and there is a mod around to correct this. Weight under the battery initially then weight in the end of the tail.
However, is LTE any different from any other aerodynamic problem that we learn about and deal with ie Vortex/Settling with Power, Ret Blade stall etc etc.
Sounds like 'LTE/Fenestron stall' = a cop out excuse for a handling error.