Hi Soph and welcome to the groups!
At the moment & as far as I know, we do not index Flex content. That
said, in general it would make sense to make sure that your content is
available in a "standard" HTML page anyway so that users who can not
view Flex content either can still profit from your content. I would
not recommend using HTML comments since users can't see them and we
generally ignore them as well.
Hope it helps, good luck with your site!
John
PS It would be interesting to see how you do this, so I'd love to see
your URL later on :)