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Well...to the best of my knowledge the Mongo DB BI connector in 2018 is still Postgres:

Has this changed?

Yes this has changed. The BI Connector 2.0 is written in Go and uses the MySQL wire protocol: https://docs.mongodb.com/bi-connector/master/release-notes/

John radically overstates his case in that article based on incomplete information; note that none of the code he points to is even 1.0 code.

Nonetheless, it’s accurate enough to say that the 1.0 BI connector used Postgres code. It was definitely the fastest way to deliver it.

2.x was built from scratch, it uses no Postgres whatsoever.