That's what they wanted the outside world to believe. But the reason was that they had realized their mistake.
Why are you saying that?
Is not that uncommon to make changes to the track and the biggest technical parts when the weather is bad.
In the last world cup they closed the biggest drop due to the awful weather conditions and only left the B-line open.
This time, in order to leave both lines open at that place, they added the plank. Before that obstacle, on the biggest rock garden, they closed the A-line for the women's race, because it was impossible the make the necessary adjustments in order to make it safe.