Two fatty ingredients in one pot. Pork belly is about 50 percent fat and coconut cream is about 35 percent fat, so there is nothing lean to dilute anything. A 180g carinderia ladle usually holds about 70g of cooked belly (around 330 calories) and 100g of coconut sauce (around 180 calories). The chilies, garlic and bagoong add maybe 10. Home recipes are far worse: Kawaling Pinoy's version works out to 1,100 calories per serving because it uses 2 pounds of belly and both coconut milk and cream for 6 people.
The sauce is the sneaky part. People eat the pork, then spoon the sauce over rice, then ask for more sauce. Each extra ladle of coconut sauce is about 90 calories, and it soaks straight into the rice so it does not feel like eating anything. A 60 to 80 peso serving with 1 cup of rice is about 780 calories, and with the extra sauce habit it is closer to 900.
The chili does not burn any of it off. Capsaicin raises your metabolism by a rounding error, maybe 10 calories over the day. What the chili actually does is make you eat more rice to cool down, which is the opposite of helping. If you want Bicol Express to fit, the lever is the cut of pork, not the heat.