Thank you for spotting this fact. After digging more, it turns out some of his command is also invalid. I've mentioned some of his problematic post on https://bitcointalk.org/index.php?topic=5482297.msg65589083#msg65589083.

To OP, have you tried reading BTCRecover documentation on https://docs.btcrecover.org/en/latest/? It's more helpful and accurate than following @Henark post.