Yes, this I agree, and the linked article also says that "burger" can be used in this way. I do agree with you that "hamburger" should not be used for the "impo

Yes, this I agree, and the linked article also says that "burger" can be used in this way. I do agree with you that "hamburger" should not be used for the "impossible burger". (However, you can write "hamburger buns" for buns that can be used with "hamburger", even if the bun can also be used with other kind of "burger sandwiches" too.)