useMemo computationally expensive calculations

I've created a sandbox using useMemo to optimize a mock expensive function follow Kent C Dodds example from this post. Memoisation doesn't seem to be working. Any ideas why?

https://codesandbox.io/s/usememo-rfphn?file=/src/index.tsx

Copyright Notice：Content Author:「Brad Woods」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/68738711/usememo-computationally-expensive-calculations

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