Blaise its a totally valid and logical thing to expect that the navbar would generate nav items based on the actual pages - you are 100% right there - unfortunately its just not something that we've really built into the site builder specifically and prompting it additionally, as you saw, won't work either. Really great feedback and I appreciate you voicing this no doubt.
As Sara mentioned, you'll have full control over the nav items within Figma and Webflow and you can edit the text of the nav items within the site builder. Apologies for the inconvenience here.