They don't show the actual field of the big metallic cylinder, so you can't rule out a situation as shown at the start of this video: https://youtu.be/D-tW8_SRW

They don't show the actual field of the big metallic cylinder, so you can't rule out a situation as shown at the start of this video: https://youtu.be/D-tW8_SRW3g https://youtu.be/D-tW8_SRW3g where two identically looking objects are revealed to have very different magnetic fields. Whether it makes sense to say the multipole magnet is "multiple magnets" is a philosophical debate in itself.