Aside: Unless "deprecated" has assumed a technical sense (i.e., jargon), it is wholly wrong/inappropriate in this context.
According to the dictionary in El Capitan the definition of "deprecate" is to express disapproval of… and that is
exactly how "deprecated" is used in computer jargon. "Deprecated" refers to something that is no longer approved and remains only to allow third party developers time to modify their product to use an "approved" command, feature, function,
etc. You are most app to see it used in the context of an
API (Applications Programming Interface) API (Applications Program Interface) that applications use to access operating system functions.
