Don't you mean, what the current public chargers are providing?
Regardless, if this is true, I could see Tesla with a major lawsuit on their hands. One of the major selling points for the Model S and X was "Supercharging for life." Based on that alone, they need to suck it up and keep their promise for the 100,000+ units that were sold before they put the cap on it.
Something else that this could be based on is the potential dendrite buildup in the batteries. Theoretically, the battery could reach a point where Supercharging at 100+ kW could literally turn the battery into a bomb. However, if that is the case, Tesla needs to have a model in place to provide a replacement battery. I guess they don't have to (i.e., Tesla owners just have a large brick sitting in their driveway), but that would be very bad for business.