Sanji, I came cross that same article when trying to gain some insight into why would anybody want to visit Chernobyl! It won't be on my list - if it's not safe to sit down or touch anything and you are checked for radiation exposure levels when you leave the exclusion zone (and according to another article I read, if those levels are high your clothes are confiscated and you have to take a decontamination shower!) then as far as I am concerned it's not safe for a casual tourist visit.
It does seem that the only people saying that it is safe to visit are the people who organise these tours and the operators association for the nuclear power industry - both of whom have a vested interest in playing down the long term danger of the site and the surrounding area.