Yes, the customer will be impressed by your speed the first time. The second time, he will expect it. The third time, when requirements have grown enough to be beyond what ChatGPT can deal with, he'll be angry that timescales have exploded.
It sounds to me like the commenter has found a subset of his work which can be sped up significantly with chatGPT and is using that to continue conversations with a potential client. Pretty cool if you ask me.
It’s called Expectation Management. It’s how successful business is done.
Marketing 101: Under promise, over deliver.
P.S. Apple is quite good at this IMHO. I notice they often very quickly go from product announcement to product availability. My theory for why this is good is that there less time in between for people’s imagination to run wild and fill in the information gaps with their own ideas that the actual product might not satisfy. Expectations remain ground when their customers receive the product vs a product getting hyped to the moon such that it’s practically impossible for it to ever live up to the hype.
Right now with the increased productivity, it leads to customer engagements that previously wouldn't have been possible for me. E.g. now it's feasible from a cost standpoint to let me as a freelancer build internal tooling that previously would have been to expensive in total. It's also easier to deliver initial MVP milestones for projects for a price that's in a much more comfortable range for smaller companies.
Yeah, that advantage may go away, but just like good "googling" was/is a skill that can set you apart from your peers, proper usage of LLMs is a skill as well that needs to be learned (and that many won't).
Or worse, they'll feel they've been scammed, and that you're a fraud.
AI or not it's not a good strategy, in life and in business, to lie regarding on what you can actually do/deliver.