If the flood story was true then the smart thing to do would be wait and see if Noah was right. Then get on the ark last minute once you are sure the world is flooding. If it was an option to wait and see, then it would not have been smart to get on the ark early because it the flood may not happen or may not happen for a long time.
This is exactly the same situation today and the GB did not think this new light through. The two new members came onto the GB and Tony was kicked out, they think they are so smart but this is so stupid what they have come up with.
The new light means don’t get on the ark just yet, you may be waiting a long long time for the flood to start. Now they are basically telling people to wait until you are sure that the flood is starting then it’s ok to get on the ark. If the flood never starts then you don’t even need to get on the ark.