Drops as in adds, or as in removes?
Quote from the article
Tesla is updating the gaming computer in your Model X and your vehicle is no longer capable of playing Steam games. All other entertainment and app functionalities are unaffected.
You ignored the sentences on either side of that:
However, we now learn that Tesla is dropping the feature. The automaker wrote to people taking delivery of new Model S and Model X vehicles:
Tesla is updating the gaming computer in your Model X and your vehicle is no longer capable of playing Steam games. All other entertainment and app functionalities are unaffected.
It doesn’t sound like current owners are affected by the change.
Notice the phrasing of New vehicles and writing to people expecting delivery of them, not current owners.