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Yep, you are correct. ISTR a no guest rule in the past, but if so, this has changed.
See here: Access to The Qantas Club lounges
*waits for everyone to start yelling about why only they should have access to the QP and no one else should*
Interesting, I wonder when they made that change?
As for guests, according to the QP access page, it appears a J pax can bring in a guest: