I find the presented facts very interesting and indeed, they are somewhat in contrast to common beliefs.

BUT: If you want to debunk overpopulation, you will have to look at many more factors than just food and water. As @alexs1320 pointed out too, it's not just about the question if we are theoretically able to feed 10 billions + people, it's also about how these people are living.
If all those people want to have a Western standard convenience life (which they want), earth simply cannot provide enough resources. Not with the current state of technology. And yes, while some resources are not limited, others are. This includes energy, as even solar panels and accumulators use valuable limited resources.

Also, food production for 11B people comes at a terrible cost for the environment, which is not just bad from an environmental point of view, but also leads to the depletion of other renewable resources - clean, carbon-low air, in particular.

I would probably have to write a full contrary opinion post on this for a good discussion... And I don't know if I can bring myself to that amount of work.

Anyway, interesting stuff!