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The gauge freedom of electrical potentials is not particularly
new, and I'm frankly a little surprised that you are not familiar
with it. I believe that you are familiar but just haven't use the
word "Gauge" to associate with the common fact that you are
free to choose a reference point, which is all gauge freedom
means in the context of electro-static potential discussions. ...
Indeed, when you teach first semester physics and talk about
gravitational potential energy and use formulas like U = m*g*h where you
define h as the height above the gravitational reference, that you get to
choose, you are excercising gauge freedom and therefore must be familiar
with the idea.
Joel Rauber