
There's nothing new about this. 20-odd years ago BT had targets on services like directory enquiries, where all queued calls must be answered within x minutes. They arranged this by ensuring that when the queues reached x minutes long all new calls got a busy signal. All _accepted_ calls were then answered within the target time.
The assumption was that they were losing about 5% of potential calls that way. One day they decided to measure the actual busied call rate, and were amazed to find that they had miscalculated the expected traffic so badly that 90% of calls were being turned away with a busy signal... Even so, they were still meeting their targets.
A lesson learned by NuLab, of course, who base everything on targets for his very reason. Lies, damned lies, and targets...