Consistent with Plug-ins, yes - but not consistent with how it worked in previous vBulletin versions:
In previous versions Add-ons usually added their links into the Navbar by rendering their own templates on a certain template Hook.
If the Administrator modified those templates (eg. if he added another link), an upgrade of the Add-on would not overwrite this modification - the link would still be there after an upgrade.
Most items (Settings, Cron-Jobs, FAQ, Admin-Help, etc.) do have a volatile flag to handle "custom items" on upgrades, and this is what is missing here.
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