Hey @PrasannaVengadesan_santhanagopalan,
Sorry about the confusion, that article is incorrect. A separate installation of libmongocrypt is not necessary to use the Node driver with CSFLE.
You can follow the instructions in the official CSFLE documentation for an example of how to set up CSFLE with the Node driver: https://www.mongodb.com/docs/manual/core/csfle/install/ .
Hope that helps!