Such predictions are exaggerated and based on false science. In fact this interesting link shows what could have happened in the worst possible case
http://www.johnstonsarchive.net/nuclear/nuclearwar1.html
1988- Soviet Union and United States have the highest number of nuclear warheads deployed in history. A worst case scenario
Even then it is expected that about half a billion people die, the tempreature drops a few degrees, NATO and Soviet Russia are thrown into anarchy, starvation and diesease run rampant for a few years and then the Chinese, Australians, Argentenians and Brazil become the most powerful countries in the world sixty years later. Ozone layer in the Northern hemisphere is 40% depleted, 5% in the Southern Hemisphere.
Not the end for all of us
In other news: Tom Clancy dies, Robert Johnston signed to book deal.
Your link doesn't even deal with post-holocaust effects other than a few lines. It states that the Earth would be experiencing nuclear winter for three years; explain to me how a worldwide famine would not kill the vast majority of people left alive? If there is no food being grown, how do we survive?
Your link even states: Now that third world countries are recovering agriculturally and beginning to reduce famine, they are being stricken by epidemics. Bubonic plague has spread to Latin America and is appearing in Europe. Africa, which has been particularly ravaged by war and famine, is now seeing the spread of various diseases going unchecked by modern medicine.
And: Some people exposed to fallout after the war are now dying of cancer; however, cancer as a cause of death among the survivors is minimal compared to other causes: disease, starvation, and exposure.
Without dealing with how any of that would affect people. Read: it would kill us all.
And then in the very next paragraph, after it's done going on about how we're all dying from disease, it starts talking about settlers going to and fro across Asia.
That link is complete bunk. Try digging up something that isn't a Tom Clancy sex fantasy.
"We have yet to fully grasp the monstrous effects of these weapons, that the consequences of their use defy reason, transcending time and space, poisoning the earth and deforming its inhabitants."(1)
-- General Lee Butler, former head of U.S. Strategic Command, December 4, 1996
"The destructive power of nuclear weapons cannot be contained in either space or time. They have the potential to destroy all civilization and the entire ecosystem of the planet."(2)
--International Court of Justice, July 8, 1996