I have to highlight the following line from the article:
‘As a result of the delay, Apple has pushed back a portion of component orders for the two devices from the first half of this year to the second half, the people said.’
With this statement, I assume apple has merely just reduced its order size down a bit to relieve the pressure, now in regards to how much this has been reduced hasn’t actually been released, this could just be 10% reduction, which will have a small impact on availability after initial launch.
This article in no way means a launch isn’t still happening, it just means after the initial stock has gone, consumers might be waiting a while to receive their new iPads.