Block is rendered even though it is loaded via AJAX

I suspect this is either a support request if I'm missing something obvious, or a bug report. My setup:

Using Views and Flag module, I am display the Most Recently Viewed Nodes for each anonymous user. So in order to have cached pages obviously AJAX Blocks is perfect. Since the View is using a Flag relationship, however, it encounters the following code from the flag module, flag_handler_relationships.inc:

class flag_handler_relationship_content extends flag_handler_relationship {
...
        drupal_page_is_cacheable(FALSE);
...
}

So whenever the View is rendered, page cache is not created for that page.

So I am trying to configure AJAX Blocks to always load AJAX no matter what, to allow the page to cache initially using the settings:

* Load block via AJAX = YES
* Include NOSCRIPT tag with original block content = NO // I'm assuming if this is YES then the view will be rendered but hidden and thus page cache never generated.
* Load the block on cached pages for these roles only = Anonymous User
* Load the block on uncached pages for these roles only = Anonymous User

With the above settings should I be expecting the block to only ever render from an AJAX call?