QF Club passes can be used QF "operated" International J lounges. LAX Int business lounge is operated by QF - according to QF.
@terryforsyth :QFClub comp passes can be used with QF and JQ flights with a QF and JQ flight numbers. So not sure why you can't access QF Brisbane International Lounge.
In other words
JQ passengers with QC passes can use
"Qantas international business lounge"
"Qantas international lounge"
"The Qantas Club"
Note the actual names of the lounges which are reflected in the QF
website
However the T&C also says that it is in the discretion of the lounge to refuse entry on capacity control reasons.