Yes, it is. Or possibly no, it isn't. But I assume what you really meant was "Does G de facto index members' profiles?". The answer to that form is Yes, it does. I just checked. My "home page"-- which of course is nothing of the sort ;)-- comes right up, with my WebmasterWorld profile as source.
Further investigation confirms that G does honor the "noindex" directive on this particular page. (If you've snooped, you know that it's there for an unimpeachable reason.) But this may not be universally reliable.
I think it's the other way around. You have to have a certain number of posts to see other people's url in their profile. Or possibly both. If you're a Forums grownup everyone can see your url; if you're not, only the grownups can.
:: looking vaguely around for Brett or someone like him, who presumably knows for sure ;) ::
Anyway, both of you have more posts than me. So if g### can see my profile it can definitely see yours.