The word “meat” describes physical objects that fulfill a specific function, for which you can find substitutes. Sausage is an oblong object made of a casing filled with protein. Steak designates a (honestly delicious) slab of protein.

Dictionaries haven’t caught up with modern uses of terms like “steak” or “sausage”, but it doesn’t really matter, because they don’t decide language centrally. Their role is to document how language is at a given point in time. And the consensus for the majority is that a steak is meat, but that is not set in stone. Things are changing. A growing proportion of people has started calling vegan sausage vegan sausage. Dictionaries might eventually follow the majority, if that majority ever materializes.

Vegan foods mean, at the very least, that a food contains no animal products. Eggs don’t fit the bill, by any stretch of imagination. It’s a straight-up lie, like saying an American Camembert is an AOP Camembert de Normandie. I don’t think you made a strong case here.

And look, I haven’t adopted all the newspeak myself. I don’t like the word “vegan steak”, because it strays too far from my definition of what steak is. Fake sausage and milk work for me. But my point is that my own stance doesn’t matter. It’s what the majority thinks that matters.