Climbing does not mean arboreal either. I have flow in an airplane, would you call me an aerial species? The designation refers to the majority of their time spent in an area. Terrestrial species spend most of the time in the lower parts of their habitats while arboreal spend almost exclusive time in trees. That does not mean either designated species never cross boundaries.
It would be like building a vastly taller than wider cage for a ball python and using a vertical thermal gradient. While ball pythons can climb into shrubbery and trees, creating a habitat as I just mentioned would be detrimental to their captive health. Dumeril's boas are terrestrial but that does not mean that providing climbing enrichment doesn't benefit them. My rosy boa climbs but if I did not have a terrestrial hot spot he would suffer.
