Well, that all sounds very prim and proper, but my translation in this instance would be:
'I understand it is bad to steal content, but writing and paying for new content will be inconvenient and tiresome because it is specialist in nature, so we will steal it anyway and try and keep it a secret.'
How about asking the doctor to contact iMatrix himself to ask for permission to use the material? Then, whatever the response, and whatever happens subsequently, it is the doctor who has made the ultimate decision, and no blame should attach to you. Don't give him advice you know to be wrong - put the ball in his court. He won't even call, most likely, but you will have made your point.
iMatrix specifically defend their content IP in the T&C of all their sites. I would think they are quite used to discovering and dealing with copiers and spinners.
Personally I have the deepest contempt for anyone who steals the original content I write for my clients. It happens frequently and there is NEVER any excuse for it. It's not something that any decent person should want to be associated with.