His post was flawed. The examples that he gave for failed goals were not set by the individuals themselves, but by their superiors. These goals were not realistic either. The rest of his post talked about how we can set something similliar to goals, when really it was just acheiveable goals.
I think goals need to be re-evaluated before the "due date" is reached. The goals may need to be readjusted, postponed, or canceled.
Even at the end, he said his kids could have had their teeth brushed and flossed if he had set their goal differently. That still wasn't possible with the time frame he had for them. That goal would only have been acheivable if more time would have been given.
Which comes back to the need to set reachable goals, otherwise you are setting yourself or others up for failure.