sure, this is basically a fancy version of the current FAQ's, customer's QnA and current recommendations (similar products, recommended products). Would it be just so much better in experience that it kills Amazon? i kind of doubt it. Also, we're currently talking model that was trained on pre-2021 data and here we have an inventory in the millions that changes daily, so the tech has to catch up, too.
Asking for your preferences to figure out your product choices or searching for a product for you based on your given requirements is a lot more than just FAQs and Q&As. You can even imagine a fancier version where you describe say what kind of setup you want and it gives you combinations that are nice.
Also this could aggregate information not just on the product page but across multiple pages which is time consuming to do by oneself.
As for 2021 cutoff -- ChatGPT can now browse the internet and if Walmart built a bot that interfaces with ChatGPT, I'm sure they would be feeding it the latest info
