I’m not sure what you’re asking/saying.
The battery usage of roughly 80% and the SOT of over 10 hours are confined to that period of time between 12AM and 11:59PM. What is not accurate?
Let's assume that the screenshot you posted is today's usage. It shows your battery usage starting from 12 am today. let's assume you charge it overnight. What if you used it a lot last night? And what if you used it past midnight? Say until 1 AM? That extra one hour of usage would show up in the chart, and it's not accurate because you plugged the in after that.