This file is indexed.

/usr/share/irssi/help/presence is in irssi-plugin-xmpp 0.53-1+b1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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PRESENCE <accept|deny|subscribe|unsubscribe> <jid>

Handle presence subscription.

See also: ROSTER