You can believe something with all your heart and that believe can be a lie. People are not machines.
The idea that a manager will go "hey, we are DEI hiring Asians" in the 80s in the bank sector... No offense but that is mixing modern 2020's politics and trying to transplant it to the 80's.
Fact is, you only have one source of this "truth", and have historical data that disproves this idea of DEI hires in the 80s (unless your white and male, then yes, there was a LOT of DEI hires and promotions that bypassed women and/or people of color).
And this is still happening today. But nobody wants to talk about that too much because that is considered the traditional family and god given right to the white male ;)
I am betting your a white male, that lissen to a lot of conservative podcast/twitter etc. You can prove me wrong but we both know the truth ;)