I believe that this might be a hint of Gladiator coming in next season(s).
The reason is that:
a) It's just weird to drop a quote that's mostly about him like that, usually the quotes are about characters themselves. There are some other instances of other characters being referred in quotes, but I couldn't find an instance where said character isn't already in the game or not a totally irrelevant side character (Admittedly, I only check around half of costume quotes, however)
b) I checked the issue that this costume (at least purportedly) debuts and he doesn't appear in it. The quote in question comes in 276, 3 issues later. I didn't find any "bangers" but she speaks a bit in the issue. So this doesn't seem to be a "well that was the only quotable thing from her in the issue" thing.