Could this be case of an extreme regulation, much like "everything is known to cause cancer in the state of California"? Czechia, Slovakia, Poland and Ukraine

Could this be case of an extreme regulation, much like "everything is known to cause cancer in the state of California"? Czechia, Slovakia, Poland and Ukraine are much closer to Chernobyl than Bavaria is, and the populations there regularly pick and eat mushrooms without suffering a wave of extra cancers.