They seem to project a very linear progression of economic events. Perhaps they have never heard of hyperbolas or logarithmic curves. They seem to be much more predictive of future happenings than linear progressions. 

Rothbardian_fanatic

econ

The CBO Isn’t Allowed to Forecast an Inflationary Debt Crisis

I doubt the CBO is using MMT models, but they are probably using fairly unreliable models. These models never seem to predict anything of any importance, but they can do ok when everything's running smooth.