Haha true. But the point is that it’s not a national currency; the standard states that the first 2 letters must come from the ISO 3166-1 alpha-2 country codes, and that X was chosen for non-national currencies because no country code can start with an X by this other standard.
It’s forward thinking to use an abbreviation that would not need to be revised if or once this currency becomes mainstream. Others who decided this way: Ripple (XRP), NEM (XEM), Monero (XMR), Stellar (XLM).
By the way, SC could be the “localized” version / symbol belonging to the XSC “official” abbreviation, just like HK$ stands for HKD.