Looks sketchy, they mistyped S&box and I don't know to what extent s&box has changed but they have a source2 license. If I were Amper Software I'd get in touch

Looks sketchy, they mistyped S&box and I don't know to what extent s&box has changed but they have a source2 license. If I were Amper Software I'd get in touch with Valve before proceeding with the DMCA request.