The original btcrecover (https://github.com/gurnec/btcrecover) has long been abandoned. The fork he is linking to (https://github.com/3rdIteration/btcrecover) is indeed the most actively maintained and developed fork, and the same one which is linked to here: https://btcrecover.readthedocs.io/en/latest/.

I don't think this user is the developer of the 3rdIteration fork.