Yes, it did become illegal twenty years earlier...but it was still in place in the Mississippi Delta, ground zero for racism in America - and no, that's not an exaggeration. Concerning the NAACP, when it was formed, it was for all nonwhite minorities (just as "people of color" is not an insult). However, then as now, when applied specifically to Black people, it is an insult.

Back to the Mississippi Delta:

https://mississippitoday.org/2022/06/29/delta-farm-underpay-black-farmers/