But it's not as easy as that, if you're thinking about large freighters. Sure, it won't a problem unloading a "just in time" urgent shipment from a Cessna Caravan, it can be hand balled off. However you can't just put someone off passenger check-in onto a Hi-Lo and expect them to operate it, nor tow around pallet dollies, or drag pallets down the floor of a 747.
I never suggested they should expect an employee to undertake a task which they haven't been trained to do. Every job airside depends on appropriate training. MAN has done this before and it can do so again. They handled B77F's relatively recently, so it is probable that some of that expertise is still around anyway.