SEO in Website Builder
Your SEO people can use the .htaccess file to do any redirects of old pages to new pages if they like. it's the standard way it would be done, but requires some technical expertise.
We have the concept of "dynamic" pages and "published pages", and ordinarily, a search engine would never see the dynamic version of a page. the dynamic versions of shopping pages for example provide multi currency, product filters, discounts, etc. whereas the published page is the default currency. published pages can't be dynamic, and people don't like the urls of dynamic pages.