Because an animal is found in tree does not make him arboreal.
No one is denying their ability to climb they are ever classified as ground dwellers and are not equipped to be in trees like semi-arboreal and arboreal snakes.
When you have an animal in captivity your duty is to understand it's needs and provide for those needs adequately, that means ground dwellers snakes in terrestrial habitats and arboreal snakes in arboreal habitats.
Pretty simple and common sense really
