First, even if the erroneous assertion about the new adult jacket were correct, I don't known anyone that can time-travel back to score that amazing deal. "Moot" is the term here.
Second, the children's down puffys are $30, not forty, and they're also listed and photo imaged elsewhere in this forum. Great jackets for small people. They were thirty bucks last year, too, when they had the "White Star" label on them. Different "brand" this year, but same item.
Third, I own the Patagonia AND one of the new Kirklands. Although it appears the Kirkland has less fill (see weights, above), the fit, feel and construction is not only VERY similar to the Patagonia but frankly, just plain good.
Costco has been dabbling in higher-tech outdoor clothing lately. Not only are they stocking some excellent tech layers, but the new down puffy and soft shell are clearly nicer that anything they've had before. The new labeling is a bit of an indicator as to which products are in their "high line" in Kirkland stuff -- not every new item have those black, tabbed tags.