If this change is only for SYD while the renovations are taking place, I can completely understand their need to lower the numbers in the lounge due to available space, while minimising any inconvenience to premium pax that are actually flying that day. However, if this is network-wide and is indeed changing in mid-August, then I strongly feel that VA needs to start providing much more notice before making such changes. A few example from the past where minimal notice was provided:
* Restriction for Gold pax to only one checked bag, instead of a simple 32kg allowance that permitted multiple bags to be checked (~1 month notice)
* Cutting the SC earn rates for many Etihad fares in half (~1 month notice)
* Removal of the low points+pay redemption options (no notice)
* Removal of Priority Pass (~1 month notice, though extended for a couple of weeks due to complaints)
FWIW, as there is now more than one person that has been told of the removal of ATA, I'd be inclined to trust the lounge angels on that one, as they are ultimately the ones that are tasked with enforcing such rules. In the past, certain lounge angels have revealed to me planned changes 6-12 months ahead of any announcement from the company. This included the removal of Priority Pass, the removal of single-entry passes from sale, the changes to the paid lounge membership prices, new valet services at BNE, etc etc. I'm next flying VA on Wednesday out of MEL, so I'll see if there is any comment then.
Would be nice to have a response from VA officially, though I suspect we may have to wait until tomorrow for that (today being Saturday).