Reason: Issue A: 07.1953 map (end of the gif) is definitely inaccurate because:
(1) the July 1953 armistice includes the following statement: "all the islands lying to the north and west of the provincial boundary line between HWANGHAE-DO and KYONGGI-DO shall be under the military control of the Supreme Commander of the Korean People's Army and the Commander of the Chinese People's volunteers, except the island groups of PAENGYONG-DO (37 58' N, 124 40' E), TAECHONG-DO (37 50' N, 124 42' E), SOCHONG-DO (37 46' N, 124 46' E), YONPYONG-DO (37 38' N, 125 40' E), and U-DO (37 36'N, 125 58' E), which shall remain under the military control of the Commander-in-Chief, United Nations Command." and
(2) the island Baengnyeongdo (PAENGYONG-DO) is colored pink on the 07.1953 map. We see in the statement above that the island shall remain under UN military control (July 1953) and hence should likely be colored green in the 07.1953 map and possibly other maps.
If the lack of precision which causes this error on the 07.1953 map is true of the whole series of maps, then this gif really needs reviewing.
Issue B: Ulleungdo, which is larger in land area than the above-mentioned Baengnyeongdo and is part of Korea, should be part of this map, and not including it is an error. Why ignore a part of Korean territory?