You've got it backwards. In 1923, your 8 million 1923-dollars was worth what $138 million 2023-dollars is today. You started with $138 million 2023-dollars, but denominated in 1923-dollars that's $8 million.

If you just hold on to it your 1923-dollars have become 2023-dollars, but there's still exactly $8 million of them. You've lost nearly 95% of the value.