Earlier quoted context omitted.
Not in the US.
That some concentration camps in other countries were also death camps is entirely the point. They are not the same thing, but they're just one step removed. In fact, thousands of people died in the American camps even though there was not an official policy of extermination.
This could be investigated further; was the average length of imprisonment less than a year, were the causes of death different than in the larger population, did economic conditions and racism increase the base death rate among Japanese-Americans in the first place, was the age distribution different among those the US bothered to move to camps, pushing their base rate lower?
Evidently people died because of these camps, and it is incredibly likely that many of those deaths were racist hate crimes committed by US employees on US citizens. Even that aside, it was very much wrong it imprison innocent civilians on the basis of their race. 'Thousands died' does seem like a substantial overstatement when the only number I can find is less than 2,000 (it's from the US, so it may be biased). Probably a few hundred died as a result of these camps, mostly from disease.