For what it is worth,
I checked my copy of AIP.
ENR 1.1-19, Paragraph 11.1.4
'After any frequency change, pilots must advise the last assigned level and, if not maintaining the assigned level, the level maintaining or last vacated level: eg, "MELBOURNE CENTRE (CALLSIGN) CLEARED FLIGHT LEVEL TWO ONE ZERO, LEAVING FLIGHT LEVEL TWO NINER ZERO".'
The copy on AsA's web site says the same thing.
Obviously this differs from BSD's copy in only one word but perhaps the good gentleman at Qantas is not as far off the mark as some may think.