[riffraff]

AFAIU, but I cannot reference, this was sent to a limited group of people, got forwarded and then became viral.

[mousa]

The way it was published does not lead me to believe that story. The link to the document riffed on documents whose authors want all Googlers to read them and fix their broken ways.

[lmickh]

According to the interview with the author linked in comments above, he published it internally a month ago. The fact that it only got linked and went viral weeks later would indicate it was originally limited.