Its a pillar! Not a pillow for the bed. I was thinking typo at first, bit repeated use.
Pillar, holds up things, like your roof.
All the issue about paint are nothing. The area they are going to weld is likely inside the car under trim, carpet, or the headliner. So it will no be seen.

And there was a missed or misplaced weld by a robot. Let a human weld it up right.
Quit making a big deal out of something they found and are going to fix.
Like everyone said you don't own the car. Just drive it like you are paying BMW to do

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