That’s all great, but irrelevant.
My point was that, and I say this from experience, if you get 8 hours of battery life on a MacBook running macOS you won’t get 8 hours running windows. You will get less, sometimes significantly less.
The person I originally replied to wanted to get a MacBook and put windows on it because the MacBook gets such great battery life. If they do put windows on it, the battery life won’t be so great anymore.