Aperture/Magnum Square Print Sale on again

I wonder why many of the prints are obviously of a 35mm ratio and not square? What's even stranger is that they list the print sizes on these as 6x6. Example below

https://shop.magnumphotos.com/colle...rossings-david-seymour?variant=12719166980183

Every print shown, has SPECS included in the listing. Here they are for the one linked:

Format: Digital C-Print
Size: 6 x 6 in (15.24 x 15.24 cm)
Image Size: 5.5 in (14 cm) on the longest side
Printed on Fuji Crystal Archive Matte paper
Estate stamped
 
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