The postNNN.html link doesn't matter since your robots.txt blocks access to it as described in this forum's
install instructions:
SeO wrote:The robots.txt : The robots.txt file must be uploaded in your domain's root folder.
You must obviously change phpbb/ with your real phpBB installation folder (or with nothing if it's installed in the root).
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User-agent: *
Disallow: /phpbb/viewtopic.php
Disallow: /phpbb/viewforum.php
Disallow: /phpbb/index.php?
Disallow: /phpbb/posting.php
Disallow: /phpbb/groupcp.php
Disallow: /phpbb/search.php
Disallow: /phpbb/login.php
Disallow: /phpbb/privmsg.php
Disallow: /phpbb/post
This is the minimum required for bots to only consider the rewritten URLs.
The index.php? is absolutely normal and does not disallow index.php 
After this you can add :
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Disallow: /phpbb/member
Disallow: /phpbb/profile.php
Disallow: /phpbb/memberlist.php
Disallow: /phpbb/faq.php
If you don't want to put too much weight on those, by the way attractive to spammers. Will save some "useless" bot visits as well.
You may need to implement additional disallows if you changed URL standard for example.
NB: I know that dcz writes long instructions, but
trust me, reading them will save you time and frustration because in the end, you'll end up reading them anyway.