Why does Kim Jong Un officially have birthdays in 1982, 1983, and 1984?

Why does Kim Jong Un officially have birthdays in 1982, 1983, and 1984?

Most people have only 1 birthday. This video at around 5 minutes in was the first explanation I heard:

This article is related to the topic https://gematrinator.com/blog/2024/12/03/south-korean-president-yoon-suk-yeol-declares-martial-law

Why does Kim Jong Un officially have birthdays in 1982, 1983, and 1984?
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