You are correct that the hooks creates a new query. However this is an additional query in the AdminCP Announcements page, and not one users would experience on your forumdisplay.
I would not have released this if it was that pointless.
Quote:
Originally Posted by stomph
There's a ) missing on line 477 in forumdisplay:
if ($announce_exists OR (!is_array($announces)))
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I have updated the installation instructions with the missing parenthesis. Thanks!