I don't think this is a dumb question. I was also wondering. They had a 19 year deal 135 million naming rights with the Miami Heat, but I'm fairly certain they didn't pay everything up front. Apparently the county owns the arena, so they will be involved.
I assumed he got paid based on my limited understanding on how actors in TV commercials are compensated. It would be weird for Larry David to be in an ad that aired during the Superbowl and not get paid.
At least Larry David got paid.