InfInflation adjustment is carried out using the Consumer price index for advanced economies published by the International Monetary Fund. The index is uniformly applied to the grosses in the chart published by Guinness World Records in 2014, beginning with the 2014 index. The figures in the above chart take into account inflation that occurred in 2014, and in every available year since then, through 2022.
Basically they are adjusted so that 10 $ in 1939 is equal to what it’s worth today. Seriously it’s basic economics.
And no, inflation is mentioned every single time someone somewhere brings up a film from the highest grossing films list. Because Gone with the wind is the highest grossing film ever.
At the end of the day, highest grossing is a worthless metric to measure in except that it’s just a bit interesting. Don’t take it too seriously.
Edit: oh and to be clear, she is still the first solo female director with 1B$. Adjusting for inflation doesn’t change that (except if there is a movie with another solo female director that goes above 1B if adjusted)