People use it as a synonym for 'unaffected'. Sometimes it is unclear what is intended, so personally I never write or say 'nonplussed'.

To be honest, at this point I think it's a useless word!

Super Bowl is a trademark of NFL, and to keep a trademark you need to "defend" it. Which lawyers presumably interpret as sending cease and desist letters every now and then

But the caveat is that trademark law only applies to usages that are likely to cause confusion within the same product category, or to imply some endorsement/connection with the trademark holder.

People using your brand to refer to your product in normal modes of communication isn't a violation of your trademark in the first place, and does not need to be defended against.

I just remember making websites using <TABLE WIDTH=100%>, and at some point reading that CSS and using <div>'s was the new, more correct way to do it. I only need a simple personal website for academics, so I still use tables for the layout.