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Finally, Super Mario Maker is beaten.
(www.issmmbeatenyet.com)
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I never played the first, but was very into SMM2 for a while, and this is how I understand it:
A level would be made utilizing a strange bug to complete, and that bug is later patched out. So the level still exists online, but the updated version of the game (which is likely needed to access the online content, so using an older version isn't possible) cannot finish the level because the bug is absent. What's left is a level that can never be finished again, so if it wasn't' completed by someone before the patch, then it's unfinishable.
But if a TAS could complete it, then maybe this is a different issue.