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TFA explains the trick somewhat oddly, to make the math angle more obvious. Here's a (random) video of someone doing it a more usual presentation of the effect:

https://www.youtube.com/watch?v=Xau8Ng4aQ6Y

Not the world's greatest magic trick or anything, but I don't think it's as transparently obvious to figure out as several commenters are suggesting.

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Linking to a 9 year old YouTube video with 36 views and 12 subscribers should have an amusing impact on their metrics.

I was going to skip the video, but after knowing the metrics I needed to add to the level of bewilderment.

The video has been up for ~80k hours. It just got 80% of its views in the last hour.

The article describes a fixed number of cards to the performer and spectator, but the video has him split the deck behind his back. Is he counting by touch to have the correct number of cards?

Yes. That's what all the "but it's obvious!" commenters are missing - normally the spectator wouldn't have all the information that TFA lays out (that exactly half the deck starts out reversed, exactly how the cards are split up later, etc).

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