It is one thing to have a clear policy of "We are not a hospital or emergency room and are not required to provide any emergency medical care." so that people don't have false expectations. However, this company's policy, or its interpetation, has gone to the extreem.

In an excerpt from the 911 tape, the desperate dispatcher pleads with the nurse to hand the phone to a passerby. The nurse flaty refuses. To the OP's point, one must wonder that if a good samaritan tried to help, would the nurse have interpeted the policy to mean she must prevent him from doing so?

Would a security guard at a shopping mall with a similar policy, for instance, hinder a passerby who tried to help?