The title is wrong: this is about ChatGPT Plus, not GPT-4.
Specifically, the author is investigating (possible) changes in the system prompt and tools available to the model in the chat interface of ChatGPT Plus. That tells nothing about the model (GPT-4).
Specifically, the author is investigating (possible) changes in the system prompt and tools available to the model in the chat interface of ChatGPT Plus. That tells nothing about the model (GPT-4).