There was an increase in thyroid cancer in children - are we just going to ignore this part. Straight after your highlighted paragraph....
Here is the W.H.O. (World Health Organisation) organisations figures from the 2005 report
"About 4000 cases of thyroid cancer, mainly in children and adolescents at the time of the accident, have resulted from the accident’s contamination and at least nine children died of thyroid cancer; however the survival rate among such cancer victims, judging from experience in Belarus, has been almost 99%."
"The report’s estimate for the eventual number of deaths is far lower than earlier, well-publicized speculations that radiation exposure would claim tens of thousands of lives. But the 4000 figure is not far different from estimates made in 1986 by Soviet scientists, according to Dr Mikhail Balonov, a radiation expert with the International Atomic Energy Agency in Vienna, who was a scientist in the former Soviet Union at the time of the accident"
Though the leak was may have been potentially horrendous, if you take into account the nuclear bomb devastion of Hiroshima and Nagasaki and the fate of the surviviors and their offspring and their childrens offspring the atomic bomb radiation had very little impact on subsequent generations