For those interested, did some digging regarding Phillip Mazzei. Surprisingly it is very difficult to find his essays online, considering that he is the one who first uttered the expression "all men are created equal".

The anonymous essay that WaPo cites in the OP proved impossible to find online...(!?)

Philip Mazzei, the Pragmatic Propagandist, 2018

https://shs.hal.science/halshs-01796549v2/document#:~:text=e...