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He is correctly referring to GTP als the underlying language model that is also used by ChatGTP.

https://en.wikipedia.org/wiki/GPT-3 https://en.wikipedia.org/wiki/GPT-4

I think it's OK for there to be multiple definitions for a TLA (Three Letter Acronym, but also Tennessee Library Association, Temporal Logic of Actions and quite a few others.)

I had genuinely never seen GPT used for General Purpose Technology until I followed your link to Wikipedia.

I don't see a point to fighting against the current, it begs the question: what could possibly be achieved?