Complex sentence: Thus, for a standards document to state that a feature is deprecated is to state that users are recommended against using it; or (somewhat more dramatically) that the writer implores users to stop using an old, bad feature so that it can be removed.
Split into simpler sentences: Thus, for a standards document to state that a feature is deprecated is a recommendation against using it. Alernately, (and somewhat more dramatically), the writer impores users against using an old, bad feature so that it can be removed.