Startupitems don't work as advertised

[markd at macports.org]

It has come to my attention that startupitems are not disabled by default.
 Yet they were intended to be as shown by the message:


###########################################################
# A startup item has been generated that will aid in
# starting XXXX with launchd. It is disabled
# by default. Execute the following command to start it,
# and to cause it to launch at startup:
#
# sudo launchctl load -w /Library/LaunchDaemons/org.macports.XXXX.plist
###########################################################


Yet startupitems have this by default:

<key>Disabled</key><false/>

Can anyone shed light on this behavior?

Mark