Mate, Champagne is a sparkling wine. In French you can even at times hear people asking for "un vin mousseux de Champagne" meaning "a sparkling wine from Champagne" instead of the short form (just saying "un Champagne" or "du Champagne").
Now, granted, not all sparkling wine are Champagne.
The Wikipedia entry begins with: "Champagne is a sparkling wine originated and produced in the Champagne wine region of France...".
I drank enough of it to be stating my case, of which I'm certain!
P.S: and btw, yup, authentic humans content only here, even if it's of "low quality". If I want LLM, I've got my LLMs.