Failed with about 58% NO: Voters Reject Stadium Tax for Royals and Chiefs, Leaving Future in KC in Question (usnews.com).

The original measure in 2006 passed with 53% of the vote: https://www.sportsbusinessjournal.com/Daily/Issues/2006/04/05/Facilities-Venues/Rock-The-Vote-KC-Facility-Upgrades-Approved-But-No-Roof.aspx

I suspect younger voters are less likely to approve of measures like this, but there might also be some positive sentiment toward the Chiefs after they won the Super Bowl.

This article digs into the details of the arrangement: https://www.kansascity.com/news/local/article287081160.html