It’s a concession stand run by the Cincinnati Marlins inside Keating Natatorium. It was called the Bait Shop when I went to St. X back in the 2000s, but they might’ve renamed it since. A video of the natatorium’s recent remodeling shows a concession stand still there. [1] I restored the POI in https://www.openstreetmap.org/changeset/170455842 but retagged it as a concession stand to avoid confusion.

[1] https://www.facebook.com/shp1901/videos/st-xavier-high-school-natatorium/1065818547585793/