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The first time this has happened, but (2021) should be in the title.

I feel like we can let it pass for a less than 2 day old article.

It's actually a repost of the same article from earlier in the year as the editors note points out.

Earlier in 2021?

Yes the editor's note at the top says: "we are re-publishing our top ten posts for the year. This is our number one post of 2021!"