4k? "They" can come up with any number they want to, some say it is as low as 28, counting only the dead firefighters.
I live in the worst fallout area in Sweden and our nature is still very radioactive. Cancer rates here are of course increased compared to the rest of the country. And of course, the worst is yet to come. I believe more than 4k Swedish people have died or have their lives drastically shortened due to Chernobyl.