Look at your headliner - towards the rear - on both sides of that brake light - do you have interior "button cap"?
In some of those vids, I see your problem - it's an entire cap that leaves the holes exposed for the Torx driver to remove the two bolts.
However, in some sedans - the headliner covers the light - and there are two trim faster caps - like oversized flat button caps - that when you carefully pry them off - will let you drop the headliner and show the light and it too uses 3-push pin type button fasteners to hold it in place.
These might be where you pry off those buttons which are really trim fasteners which then frees up the headliner to allow you to bring down the 3-rd level brake light and get at the bulbs.
IF I remember correctly as I worked with another poster in a similar situation of having to replace the sedan version of that upper brake light - they had trim fasteners that when removed allowed the owner the ability to bow down the upper liner and get at the light - they wound up replacing it (whole thing) due to another condition with it.
