I read through it from top to bottom but still feel that this usage of donor is severely stretching it. All the examples there make sense to me, and none of them go against the core definition of the world their using to explain the concept.

As far as I know, the term donor is defined to mean that the entity voluntarily gave something. Using it in a context without the entity being willing still seems to be invalid to me, but as I said: I'm by no means an authority on the English language