Trying to approach language use with a scientific head and demanding evidence seems innapropriate to me. language is a tool and we fashion it to how we want to use it. There may be precedent but ultimately there's no right or wrong to it. The whole point of it is to make something or other communicable.
All specialist fields often apply language differently to the coloquial uses.
There's a false dichotomy between the terms principle and technique as they are applied in martial arts in one sense and this applies elsewhere too.
If we take the principle and technique seperation as it is applied in martial arts and try to apply it in a coloquial use it still makes sense and is applicaple in the same way in my opinion. Theory and practice can never be mutually exclusive, hence the dichotomous nature inherent in the terms used this way.
Take a given persons moral principles (theory). Doesn't he apply them in his daily life? (practice) or are they forever exclusively in his head never acted upon in any way. That simply isn't true. Specific ways of interacting with people that uphold his principles would be in perfectly understandable language the "techniques" he uses to live by his principles. the principles are contained within just the same.
It sounds wierd perhaps only because we aren't used to applying this coloquially to behaviours, communication (language), body language and actions etc - calling them techniques.
However it doesn't make it "wrong" and demanding evidence seems innapropriate to me and somewhat of a category error. All you need to modify language or use it in a sense not seen or been common before, is a good enough reason.
I'm sure body language has been coined with the term techniques. You can probably go find a course that will teach you body language techniques - so we can find precedent there. Lets' say I'm talking to someone and they start talking about stealing in a very blase manner, I can tell that their principles on the subject don't match mine. The language, verbal and physical I use to communicate my reaction to this difference that reflect my principles can rightly be thought of as technique(s) or to use a definition - principles in application. I'm just practicing my principles or "practicing what I preach". The way we use and structure language to our own ends can be said to be full of techniques also (sophism used by lawyers and politicians for example), how we use our voice etc. to convey our feelings.
Ultimately I see little difference to how these terms are talked about in martial arts and how they can be applied coloquially, if any.
just my 2 cents.



