tbf a lot of people do still say exactly that, equivocating between Soviet antisemitism and Nazi antisemitism and accusing the Soviets of just continuing to run the camps and so on.

I haven't see them be asked what they meant by the latter and they don't exactly cite sources, but I think they're referring to the camps continuing to be used as temporary housing for the inmates during the end of the war and in its immediate aftermath, which is a pretty heinous way to mislead people.