About the timeline, if we want to be negative, they simply added the VO processing time to decrease the number of inquiries, or just decreased the number of staff working on the family sponsorship, then they generate a fake statistic, and post it on their website.
But if we want to think positive, it only means during the past months they focused on finalizing many cases that have been open for a long time, and finished them. Maybe the conservative government have done it to increase their chances in the next election. So it can be even a good news. They tried to finalize the cases faster.
I cannot think of any other reasons.