Of the 120,000 Japanese in camps, 1862 known to have died. That was lower death rate than the US overall. Probably cause there were fewer elderly since immigrants tend to be young. I'm sure there is research if deaths were excessive but couldn't find it.

Compare to German concentration camps which would probably be called death camps if not for the extermination camps. Or to the Japanese internment camps in China.

Internment camps were bad but they are lower level of bad.