Oh so you mean it wasn’t used that way in a historical context? Got it.
edit: ...also I didn't know it was even used this way, back then, see my TIL reply in some "cousin" comment.
But if you still mean that the specific term "wellness farm" COULD have been used as a euphemism for concentration camps (regardless of whether or not it ever was), then what's the point? Like people also COULD have used the term "suburb" as euphemism for a concentration camp. Should we also be skeptical of anyone who says they want to build suburbs? What's even the point of of saying that a term COULD have been used as euphemism historically?