The October status report says "what the fuck going on" and why the numbers are changing:
#73,394
It's basically what's been said in this thread over the past 2 years: they did most of the quick and easy tasks in the early part of the tech update development, leaving the more difficult, work heavy tasks for later.
Problem is that they made each easy task equal to each difficult task when determining percentage complete. So a task that took 1 hour to complete equaled a task that took 100 hours in terms of "percent complete."
What they are attempting right now is revaluing tasks based upon their workload/difficulty to give a clearer picture to what the status of the progress is.
Just wait until the Bugs/Issues bar starts to crank up the number of tasks if they get to the point of playtesting the tech update.
Again, you can't milk that which you give to everyone for free. While people have many reasons for subscribing to DC, access to play the game isn't one.