This is completely incorrect. It is physically impossible to make a connection to a hidden service without the hidden services onion address (I am talking about the current v3 onion addresses, the ones that are 56 characters long). This is thanks to the fact that the onion address itself is the hidden services public key.
If you keep your onion address private then nobody can connect to your hidden service or even know that it exists. Simple as that.
If you keep your onion address private then nobody can connect to your hidden service or even know that it exists. Simple as that.