To my reckoning at fat = 9 kCals / g, 10 lb is 40770 kCals.
That’s a 3700 kCals daily deficit.
How the * can a person shift that in 11 days unless they are seriously ill or have had a knife attack?
To stay healthy, you must have consumed minimum 1500 kCals, so your daily exercise must have been 120 miles on a bicycle.
Keep it up.
Unless you've lost 7.5lb of water.