Can be viewed in full here: My Platinum News | Qantas Frequent Flyer
Mine reckons I've only done 18,000kms in the past 12 months.
It appears to be basing the distance travelled on flights booked under a QF code (Qantas operated and Qantas codeshares); JQ flights may be included as well. After reviewing my travel over the period (01 August 2017 - 31 July 2018) stipulated under '*' in the 'Important information' section at the bottom of the email, I've noticed that the flights I took with British Airways have been omitted from the total distance travelled. My Qantas frequent flyer number was included in all bookings.