Yes they are.

> The word concentration camp has a specific connotation with the extermination camps build to eliminate (aka kill) Jews and other undesirable under Nazi Germany.

Those are the most well-known concentration camps to many people today, but the term is older, going back to Spanish practice in Cuba in the Ten Years War and popularized for British camps in the Boer War.

Extermination camps are a distinct subcategory of concentration camp, and have a unique name specifically because their nature is not fully captured by “concentration camp” (which in their case was—somewhat amazingly for a title that even before that was typically associated with things that by modern standards would be grave human rights abuses—was actually a consciously used as a deceptive euphemism.)

> To conflate the two here like many people conflate Japanese internment camps with “concentration camps” is so off the scale it borders on misleading.

“internment camp” is a synonym for “concentration camp” and those operated by the US for the Japanese were exactly concentration camps in the usual sense of the word.