I'm pretty sure that article is talking about the feature where, if MacOS realizes that you always plug in your laptop at night, and unplug it every day at 7 am, it will pause charging at 80% until like 5:30 or whatever time it needs to, such that it will reach 100% exactly at 7 am.
Right, it tries to guess and it's not very good at it. But IME if you do pretty much always use it plugged in as was being discussed above, it will just stay at 80%.
