The cartographer did not sell the explorer map.
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Explorer maps are sold by cartographers as part of their tier 4 trades. Before selling the explorer maps, the cartographer will offer an emerald for a certain amount of paper (as seen in your video). When you close and reopen the interface, the cartographer can now offer an emerald for a compass. Once that trade is completed, it will then offer an empty map for 7-11 emeralds. The next trades the cartographer unlocks are the trades for the explorer maps.
If you have any questions concerning trading, take a look at this web page and see if it answers your question. Hope this helps!
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