The primary source for that wikipedia quote argues that the act of evacuating "just in case" caused deaths and that had people remained in place no such deaths would have occurred.
Over 65,000 people were evacuated from the vicinity. One such death, for example, was 102 year old Fumio Okubo who lived 30 km inland and hanged himself after being forced to move for no good reason.
There were 2,202 disaster-related deaths in Fukushima\*, according to the government’s Reconstruction Agency, from evacuation stress, interruption to medical care and suicide; so far, there has not been a single case of cancer linked to radiation from the plant.
That is prompting a shocking reassessment among some scholars: that the evacuation was an error. The human cost would have been far smaller had people stayed where they were, they argue. The wider death toll from the quake was 15,895, according to the National Police Agency.
Of the disaster-related deaths, 1,984 were people over the age of 65.
~ https://www.ft.com/content/000f864e-22ba-11e8-add1-0e8958b18...\* technically not "in Fukushima" but any deaths over the following seven years in the group evacuated from Fukushima.