The bandwidth comparison between MQA and 18/96 FLAC dates back to an observation by Jussi in January 2016 as to why he wasn’t convinced by arguments in favour of MQA. The other point he made at that time was that the filters looked leaky to him. Archimago has confirmed the latter, and no one has really doubted the former.
Jussi’s point wasn’t that there was some existing available streaming service. Just that if bandwidth was an issue then there was a possible open source software solution.