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Casting, such as Chrome-casting, or using a Roku or Firestick all result in using "hotspot" data. Miracasting, which is supported by Samsung phones (and some others) creates a direct wifi connection between the phone and aTV doesn't count as using hotspot data, but Miracasting is a tempermental technology and the results are often not totally satisfactory.
I do believe that Apple TV can also implement "true casting" but I don't have any personal experience with doing that.
I'm not sure what you mean by "true casting", but if you mean not using any hotspot data, then, yes. When you're using Apple Airplay via AppleTV, then no hotspot data is used.
The same is true when you use Sling TV, as long as both the receiving and transmitting devices use the same hotspot. Different networks? Then you'll burn up data.
Edited November 19 by Zulu
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