On the video on bleau.info the climber uses an undercling on the right. For me it felt easier to use the right undercling starthold for a heelhook after the first move, and just use the arete for hands. The boulder is nice when you are short because you have to squize between two boulders. Finish with a high right heelhook.
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.