The present perfect is a present tense, describing a present state, and you should think of the "rule" with the present perfect as a requirement that the timepoint or timeframe involved must include the present.
After T is generally used to locate an event (with a stative verb like be it locates the beginning of a state) at a timepoint rather than in a timeframe, so it is usually awkward with a present reference—we rarely use the present to narrate events. It works more comfortably with past or future reference:
After the last update the game stopped working.
After he has been to the mountains he will never be the same.
So I would avoid after with a present perfect. A better way of expressing what you're after is with since, which does imply the entire timeframe:
Since the last update the game has stopped working.
Since that week in the mountains he has never been the same.