Don’t doubt this conspiracy yarn has been around for a long time. Until now either I had never heard of it or, if I did, I paid no attention and wrote it off as crackpot coffee and doughnut shop gossip- which is what it is.
Further to what Wim and Klaus wrote, I agree. I knew and worked with German and Hungarian vets who experienced Soviet hospitality as POWs after the war. Went to school with Polish kids whose civilian parents experienced the same during the war. Also worked with a couple of German and Italian vets who experienced British and Canadian hospitality as POWs during and after the war. No comparison.