[thaumasiotes]

> There isn’t one singular “German.” Sure, there’s a standard form in the country Germany, but the language family is more diverse than that.

This is a statement with no implications; "Germanic", in its meaning "related to German", will mean exactly the same thing regardless of which dialect you designate as "German".

Compare how "canids" are the same taxonomical group of animals regardless of which animal within them is called the "canine".