Critical bit being,
"However, to produce this collapse, the researchers had to run the model for 2500 years. And they had to add a huge amount of freshwater – less than in previous simulations, but still around 80 times more than is currently entering the ocean as Greenland’s ice sheet melts. “So that is absurd and not very realistic,” says van Westen.
Moreover, the simulation didn’t involve any global warming. The team now plans to rerun the simulation to include it."
It's giving hints of: