That's all factually correct. Though both things can be true: Disabilities can be a disability in themselves and additionally the disabled can also be disabled by the society around them. Someone fully blind might not be able to distinguish some poisonous mushroom from an edible one with the same shape and smell but different color. That is a fundamental limitation of the inability to see. But blind people can for example still read. They are often just not provided by others with writings that are accessible to them, although that would be possible and is not a fundamental limitation of their condition.

Also ableism and othering are very much a thing that disables peoples' ability to function in a society and come exclusively from the social environment rather than from the disabled themselves.