That wavier still may not protect the landowner if you do something wrong that harms somebody else or their property as a result of your actions that were taken with the landowner's permission - hunting.
Where the wavier works is by helping make the landowner not liable if you hurt yourself as a result of your activities on the landowner's property, which is good, but only part of the risk consideration.
The other aspect remains as well. If the landowner doesn't know you, is it prudent to be inviting you onto the property, ostensibly to conduct activities in isolation from the landowner, while armed. Even if you aren't a criminal of some sort or have bad intentions, that doesn't stop incompetence. How would you propose the landowner vet your competence?