True. However a forest fire is completely different than a little bonfire. When the flames are 100 ft high you can't stand within hundreds of feet due to that heat. Its enough to melt the vinyl siding off houses or PVC window frames. Rain will only slow them down temporarily. By the time the fire actually gets there it doesn't matter if it was dry or wet. The heat has dried it up already. It will all burn. Just the matchstick trunks are left because they take too long to fully burn before the fire has already burnt up the branches and underbrush.

So I do consider the case in the above picture suspicious. Perhaps good firefighting protected the trees, they may have been coated with an inhibitor dropped by the bombers, or both. Maybe the developer skirted the rules as per the fire codes. Who knows.

Underestimating a forest fire is a good way to end up dead.