I don't care. Anything can become steampunk, therefore it fits. Anime cons are now just more like general cons than anything to me. When I can see a Superman, a Sailor Moon, a Sherlock Holmes, and musicians all at one con, then it's a good day. As for Asian steampunk, I can't find the picture but there was a group of Asian people cosplaying steampunk miners/laborers. They were really cool and really authentic.
The decision to keep out cybergoth but let in steampunk was probably a bit unfair, but maybe for the next time you (or they, whoever is running the panel) can give them a list of reasons why their panel should be accepted; not dissing other topics for panels, but just why that one should be given the green light