Everyone I ever wrote a SPA flash site for (including lots of custom carts / online stores), I also wrote HTML-only versions for that were mostly used by crawlers. I made sure these contained the same content as the SPA, and that the SPA would jump to the appropriate section and "page" or product based on the links, since it was understood that Google might penalize search rank if it were found that your flash content didn't mirror the HTML content that would otherwise appear at a given URL. (I'm not sure whether it was a myth, but I heard they had actual humans verify this drom time to time).

The purpose of the Flash app was to make the site more beautiful, not to obfuscate the content.