Not quite true. The statement released 14 hours ago says:
"het is onder de huidige corona-maatregelen niet mogelijk en niet verantwoord een Elfstedentocht te organiseren." (www.elfstedentocht.frl/geen-elfstedentocht/)
Which means that, under the current measures taken by our government, it is not possible, nor responsible to organize an 11 stedentocht.
Their main point is that it is not possible to organize the event and get everyone to stick to 1.5 meters.
Besides that, they also state they think it would be irresponsible to organize an event that would attract hunderds of thousands of people, and put more pressure on hospitals.
Admittedly, that final point would not change if the government decided to grant an exception. But such an exception would be cause to re-evaluate this decision. Since the current rules are such a large part of the justification of this decision.