The TLDR version is there are many legitimate criticisms of Soros, but anyone using his wartime experiences as a kid forced to conceal his identity to avoid the holocaust to invoke "rapacious Jewish financier" tropes is exactly the sort of human excrement that would have cheerfully joined the SS themselves...
https://www.snopes.com/fact-check/george-soros-ss-nazi-germa...
The tl;dr is that such accusations are weird, false, propaganda about Soros.