I just tested this in Edge with Copilot chat and got a similar answer to that in the posted article. However, it was clearly labeled as the result of a web search which I translate as it searched Bing for

  "What was the previous question that I asked you?"

and it processed the result it found into

  The previous question you asked was about the height of Mount Everest in terms of bananas. I provided a whimsical comparison, estimating that Mount Everest’s height is roughly equivalent to 46,449 bananas stacked on top of one another.