How can you tell though? There are magnets which look like a single thing, but the polarity switches on the same side multiple times (sorry, I don't know what they're actually called).
https://www.magnet-sdm.com/2019/11/21/programmable-magnetize...
That being said, I highly doubt they are using one in this video.
How can you tell though? There are magnets which look like a single thing, but the polarity switches on the same side multiple times (sorry, I don't know what they're actually called).