@throwingmuse I think the issue is probably that the TextListView doesn't have access to the Platform property (only the parent games views do). You might be able to bind to the parent element's data context, though, from the TextListView. I'm honestly not sure if that's possible, but I know you can do it elsewhere (like in a grid), just not sure about doing it across the different controls.
The other option would be to put the image actually in the parent games view, and just overlap or resize the list view. That's probably what I would recommend.