As Al says it’s a very rough guide.
You have lost the weight through diet and exercise, the exercise bit will have added muscle mass. BMI doesn’t distinguish between muscle and fat. It just looks at mass / height as two components in a very simple equation.
At the extreme end of an example, Jonah Lomu, that monster of an All Black winger who trampled the Underwood brothers at the Rugby World Cup? His BMI was 34 when he was at peak fitness. Which is at the top end of obese. He was nothing of the sort. Sir Chris Hoy was similar, his silly thighs were not normal.
I’d ask the questions of how I felt, am I fit? How does your body carry the weight you have? Being fit is more important than being the “correct” weight. I know some very skinny lean looking people who are physical wrecks. They are constantly ill with colds etc, a couple of them have massively high cholesterol, one has type 2 diabetes, but looks like he needs a damn good meal.