Bittrex likes to contradict themselves, in that same statement you posted they go on to say "Bittrex will make all reasonable attempts to credit our users BTG but until we have a fully supported wallet, we can neither guarantee tokens or consider creating a market. We will continue to monitor the state of the codebase and network. We'd also like to encourage the BTG development team to reach out to us." So who know if we will see it on bittrex