I was curious about this value as well. Couldn't find any clear explanation in DJI documents.
Finally, I received the answers to my questions from DJI support in details.
Here we go -
The 69,229 is your Flying Experience Points, also named Growth of Value on the APP.
The Mileage Displayed in the DJI Cloud Server (unit: meter) +Flight Time (unit: second) x 2 = Experience Points.
Please note: The flight mileage and flight time displayed on the APP are accumulated according to the local flight data on your mobile device, which will be reduced accordingly after the local record is deleted. However, the DJI Server will not reduce the recorded data due to the deletion of the flight data on your mobile device. So we used the flight data on DJI Server to calculate the experience points.