I am not sure how are you ending up with these results. The earliest hook it should work at is roughly admin_init. Anything as early as load process (wp-settings.php, including function.php, plugins_loaded, and even init) should (and does in my installation) produce fatal error, because function definitions hadn’t loaded yet.
The definition for these functions (wp-admin/includes/plugin.php) are only loaded after bulkd of core load (wp-load.php) is done.
In a nutshell documentation is correct and it’s a mystery why it works in your case. It shouldn’t, short of exotically customized core load process.
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