You have been given complimentary Gold status for another 12 months. Don't know when you last looked at your status page but this normally happens ~8 weeks from reassessment date and is what is commonly referred to as being comped status. There is no hard and fast rule who gets it, why and how often.
FWIW I have been comped Platinum 3 years in a row ~8 before reassessment date but I have managed to make the necessary SCs required each time.
You could be right about the 8 weeks. I don't look at my Summary page all that often and even then I could very easily have missed the "1" in place of the "0". I just thought that Qantas made it clear in writing that you have been "comped". I'm sure I got one for PS about 10 years ago but I also qualified in my own right that year. Maybe they now wait for you to actually fall short before reminding you of their generosity. I should find out in 6 weeks as the chances of me earning 130 SCs is quite remote unless there is a last-minute trip to SEA.