Similar scenario happened to me. Last week booked virgin syd-ool for 12 December due to better schedule than Qantas as their last flight left around lunch. Was surprised virgin had greater frequency into the evening. Virgin subsequently reduced their offering to a daily flight departing circa 11am. Thought it might be insider knowledge that the boarder would still be shut?We have had a lot of issues with my work and VA putting in fake / optimistic schedules only a couple of weeks out then consolidating and cancelling the night before. It was part of the reason we have moved a majority of flying away from them despite the money they owe us.
To be fair we had the same with JQ for a while but QF and JQ seen to have more stable schedules and more reliable to fly, perhaps carrying more freight than VA?