Yep, that is what I was talked about. Those guys made a mathematical model, which works good in many cases. This is the result in science. But they came to it through some process including so called creativity which is not formalized. And their way of qualitative reasoning of the concepts is in many senses metaphysical. These concepts are considered to be related to science insofar as they help specialists to build working mathematical models and to make correct predictions. You can call them mnemonic rules. They have no sense separate from mathematics and experiment.
Never.Actually this err... discourse has nothing to do with physics, it is about philosophy. Scientific instruments like theories, terms etc. are designed for a specific purposes only. Using it in philosophical dispute is senseless.
For example there is a mnemonic rule to remember colors in a rainbow: "Roy G. Biv". It really helps to remember colors. Of course, someone can interpret it in a way that there is a God and His name is Roy G. Biv, but it hardly proves anything.