I'm saying that an HTML5 export, when hosted on an HTML server, can be reached from an URL in a compatible browser on any device.
In my knowledge, TVs do not have compatible browsers.
But some were able to support APK, so an export in Cordova worked for those.
Perhaps you should check out the available exports : scirra.com/manual/122/testing-and-publishing
Then, according to the specificities of the platform you are targeting, use the appropriate export.
But the answer to the original question you asked was indeed that HTML5 export allows for "cross-platform" right out of the bat.