A beautiful property of using ints to represent dates is that you can manipulate them using simple arithmetic. For example, if you want to refer to noon-time on 20200806, you can simply divide the day in two and write it as 10100403. An elegant, DRY solution to a perennial problem.
The poster is gently teasing the idea that integers like 20200806 are a reasonable way to to represent dates. Dividing 20200806 by 2, we get 10100403, representing the half-way point of the day (noon-time). Of course it's nonsense.
