To be frank this sounds pointless; I don’t expect veggie burgers to be “disguised” as beef burgers, to the point a clueless customer might buy one when they want the other. So it isn’t protecting anyone. (It isn’t harming anyone either, really. Call it “veggie patty” and it’s still the same.)

On the other hand, I do expect people to put a lot of random stuff in burgers - such as cheaper / non-beef meat, fillers, etc. - so that would be better grounds (pun not intended) for legislation.