Yes, 滷肉 ("braised meat") is highly concentrated. You can't eat the sauce by itself like a stew, it would be too rich. So it's usually served on white rice or in this case noodles.

The ingredients are typically finely minced fatty pork with soy sauce and strong flavorings like dried mushroom, garlic, star anise, and a fermented bean sauce that's super salty. Plus other ingredients that make the taste unique to the chef or shop.