doesnt it just mean the ad isnt part of the context? that they are isolated from each other and the ad cant steer the conversation?

I get what youre saying, but I do think its important for them to point out the ad is sandboxed.

I totally agree, but the framing is critical.

I guess the question is, when I write a prompt into ChatGPT is the answer the entire response I get back, or is the answer just one part of the response I get back.

To date the entire response = the answer and so users likely see them as synonymous. That metaphor is being broken now and we're saying "no actually the response contains multiple things and only one part of it is the 'answer'".

Maybe I'm the one splitting hairs though.