Is content generated by Kafkai considered reselling?

The short answer is: No, it's not considered reselling. You can use the generated content as you wish. There is no legal binding for you when you use the generated content.

The subscription that you pay gives you access to use the generation service and the algorithm to generate content. The contents are generated in such a way that it is unique and does not have any rights to it, as it is generated by a machine.