Easy to explain, they had nothing to do with the chips except order them and deliver them.
Now if when the chips came in they had to do anything with them, then they would be late.
Don't worry, they still messed up. They said they would be clear of their backlog by the time the chips shipped.
This might be the post you are thinking of where Josh says they "expect" but can't guarantee the current back order to be cleared by mid September. Definitely "messed up" on the "expect" part...