Not really -- security by obscurity is a re-statement of the idea that the security mechanism shouldn't need to be secret for the security to have meaning. You

Not really -- security by obscurity is a re-statement of the idea that the security mechanism shouldn't need to be secret for the security to have meaning. You're allowed to have secret data, just not secret mechanism. And relying on what looks like secret data (changing the SSH port) where the number of bits of entropy is low enough that it's plausible to try them all (16) probably still counts as security by obscurity -- it might hide you from many attackers, but it's not enough to make you secure. Relying on data that's not actually secret, just hard to find, is just insecure.