I can see where the author came up with your "bolded" interpretation.
"It leaves wiggle room".
Sometimes, when a carpenter wants a board "at exactly" the right length, he cuts it a bit long as he can trim it later. Why would the carpenter do that?
Economies of scale.
Example: Can you look at a board 8 feet long, and tell if its 1/8 in short without measuring? Probably not...
But, can you tell if a 1/4 inch board is longer than a 1/8 inch board? Of course..the 1/4 inch is double the size and it will be obvious. You see, when the carpenter "trims" the board, he is looking at "how much he should cut off to make it the right length", not the overall length of the board.
..So, Scotus is leaving themselves "wiggle room", to change the decision, especially if the lower courts "go too far" protecting the governments actions. This wiggle room is necessary to keep Scotus decision "A" from conflicting with "Scotus decision B".
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