No, "sites" would imply "web sites that you could just as easily open in Safari", which is not what they're talking about here. They're talking about implementing an app in Javascript stored locally (still accessible when you have no connectivity), and then being able to download updates to that code directly from the developer rather than through the app store. A lot of people (including myself) legitimately wondered if Apple permits this, since it bypasses Apple's normal review process for apps. Many of us (especially people like me who aren't regular iOS devs and have only anecdotal knowledge of their rules) didn't realize that Apple has an explicit and intentional exception for Javascript run via webview that applies to more than just web pages.