And also, the land is not permanently uninhabitable. You have to postulate that living things have no tolerance above background radiation to say that. But there are lots of reasons to think that's not true at all. For instance, places like Ramsar, Iran have background levels 80x normal and there's no sign of decreased lifespan or other health impacts.
Also, checkout this wildlife around Chernobyl: https://thoughtscapism.com/2019/05/08/what-about-radioactive...
"But Wertelecki is keen to point out that the study does not claim that radiation exposure is definitively the cause of the defects. The study lacked data about prenatal drinking and the diet of mothers in the region, he stresses. Both are key to under-standing the causes of the defects as fetal exposure to alcohol and a lack of folates during pregnancy can lead to both types of birth defects.Alcoholism is rife in the Ukraine and generally low standards of living for much of the population also mean diet can be poor. “Alcohol and folates are among the factors involved in certain birth defects. A lack of folates combined with ionizing radiation could multiply the risks of birth defects or at least greatly enhance them. Alcohol is a factor in microcephaly, as ionizing radiation can also be, and combined their effects could be enhanced”, says Weretlecki."
https://www.thelancet.com/pdfs/journals/lancet/PIIS0140-6736...
"You might be surprised to know that increased birth defects were never detected in the population irradiated by Chernobyl." was what you stated and I've just shown that is not true. The cause is unknown but your statement is provably incorrect.