The video doesn't show the right exit of the 6b. The 6b exit is on the right with slopers as written on the bleau.info website. I can tell because I have climbed the straight version of the boulder that is for me more a 6a than a 6b. Maybe we should open a line called Coeur Léger direct and grade it 6a. The beginning of it is really nice to climb though and not so easy because a little bit overhanging and on crimps.
Rain sucks, but broken holds suck even more. Remember, never climb on wet rock in Fontainebleau.
The sandstone becomes brittle, and pulling on it will ruin classic problems. Drying it doesn't help, because it's still wet and weak inside.
All you can do is wait for better conditions.