No, it always means a power ratio. That sometimes can imply something else, but that's on you to work that out.

Yes, but that, i.e. putting the burden of disambiguating some meaning from context on the receiver instead of the sender, is just bad communication.

What? Blaming a bad communicator for bad communication is fine. Blaming their words because they used them badly is not.

What about blaming a common but confusing usage of some words pervasive in some fields?