This simile is utter nonsense from the outset. Pi doesn't change. It's the same regardless of who you are, whether you're a human, a dragonfly, or a rock; it's the same whether you're measuring in planck lengths or astromical units.
Language is the utter opposite - it constantly evolves and changes, with new words entering every year and grammatical patterns changing over time as well. The only way to stop a language changing is basically to stop using it.
Changing the value of Pi specifically to solve the Square the Circle problem actually nearly happened, which would be he context of grandparents post, I'd wager.
Language is the utter opposite - it constantly evolves and changes, with new words entering every year and grammatical patterns changing over time as well. The only way to stop a language changing is basically to stop using it.