I can’t answer your question, and I’m not familiar with that specific component; but I will say that negative margins can certainly come in handy in a variety of scenarios.
In the screenshot you provided, it appears as though they are being used to compensate for the 40px padding on the corresponding sides. As such, it at least appears to have been an intentional design choice in this case, but I could be wrong.
Yeah, I have definitely used negative margins but this one was very odd. No need for it. It was making the page scroll to the side as well, which was not very nice. Thanks for the comment, I can’t see any of my other apps doing this but I didn’t start using the component library till recently.