Edited to replace original incorrect Herzog attribution with my own version that correctly attributes the quote
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If it's more serious misinformation, it probably warrants taking down the post, even if unintentional. The nuance would then be that genuine error doesn't immediatly warrant banning, even if the post is taken down.
This one is a mild and unintentional case with little implications either way. If someone were to cite this as "But this one you left up!" as excuse for a different, more severe case, the mods would justifiably say that it doesn't apply.
Besides, it's not like setting a precedent is as serious for community mods as it is for courts of law - mods can change the rules when a situation arises that warrants it and enforce them accordingly, make one-off decisions for special cases or admit a previous decision was a mistake and generally have more leeway.