Roku frowns heavily on IPTV services as most are nothing more than pirates. At a quick glance Supersonic may fall into that class. Either way, they (Supersonic) would have to create a channel/app for Roku and given that they haven't done that I'd say there's a pretty good chance they don't have the rights to what they're offering.
Note: Roku isn't Android in case you were wondering.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee.
