Depends what they mean by “traditionally” and its iimplications. Did it use to be Hungarian? Sure, at some point it was. So if by “traditionally” they mean “formerly”, fine. It’d be an interesting move if neighboring countries (Ukraine) agreed to this, provided that Hungary at the same time relinquished any claim on the same territory, and Orban got his tongue out of Putins ass.
After all, there are many territories that is “traditionally” part of a different country. Karelia, Königsberg, Northern Ireland, Tibet, Hawaii, just to name a few. But the world has (mostly) moved on out of pragmatism.