Yes, Hitler certainly escaped to Patagonia in Argentina and was seen by many people. He was also witnessed in his motorcade as they drove through Germany on the way out.
The Russians kept the skull from the burned body that was supposedly Hilter and when genetic testing became much more common they analyzed the DNA and they knew with a certainty from that that the body that was recovered was not that of Hitler.
Although we are told that Switzerland was neutral during the war the allied forces knew otherwise and the US Airforce heavily bombed Switzerland during the war. They were bombing the Swiss because German trains were passing through Switzerland all the time with impunity and the Swiss were actively assisting Germany.