The code in that image [1] is written in wenyang-lang [2], a programming language based on Classical Chinese.

It was previously featured on HN here: https://news.ycombinator.com/item?id=22213406

[1] https://visual-fonts.com/#jp-carousel-1092 [2] https://wy-lang.org/

Do you mean the og:image? It's Sieve of Eratosthenes, not FizzBuzz.