Is there a bun on that? If not it's just a Salisbury steak which I assume is the Japanese influence creeping in. Never quite understood why they like hamburger steak so much. I always associate it with frozen dinners.
I like Salisbury steak but loco moco def feels different to eat. Hamburger steak usually isn't served with gravy in my experience thus far but Hong Kong has amazing steak with black pepper gravy.
Ketchup is just tomato gravy anyway. A sauce made by thickening a reduction of something high in glutamate with cornstarch. It's more of a gravy than chip beef gravy, which is a more basic roux. Only difference is fat content, but that's why it's paired with mayo.