They'll try and argue that it's just the generic term that is most familiar to their customers, not a specific definition of what you will find if you take that seat. "Aisle" "middle" and "window" are just commonly-accepted shorthand for the first, second, and third seats in a row, not prescriptive definitions.

Source: I once worked for a Extended Warranty company and they do the exact same crap. The product they sold is a service contract, it has nothing whatsoever to do with actually extending your existing warranty. But they were allowed to keep calling it an "extended warranty" and use that term predominantly and market off it, because that is the term that is in common usage for the product they sell. All they had to do was add tiny text at the bottom of the site that said "A service contract is often referred to as an “extended car warranty,” but it is not a warranty." 🤣🤣🤣 At worst, the airlines will have to do something like that.