People who are aware of Ubuntu's Unity will also know that it obviously has long existed on Linux, so there is no confusion. Simple heuristics made abundantly clear more than any additional title clarification could.

There are a lot of products in tech, and a huge number of name collisions. Context (such as the fact that the linked domain is unity3d) saves us all from having to add caveats and clarifications to every mention. Just as I can talk about Microsoft Windows without noting that I'm not talking about panes of glass.