Your link doesn't go through for me, but this page[1] says
>LIVE/APPLICATION/Under Examination
>The trademark application has been accepted by the Office (has met the minimum filing requirements) and that this application has been assigned to an examiner.
Which, apart from some grammatical confusion, is pretty clear. It looks like they have GPT-3, but GPT, ChatGPT, and GPT-4 are all still pending.