This is one of those funny and illogical arguments that come up often and uses a rather common (and ironic) propaganda trick of just denying a massive failure ever existed.
This is the equivalent of stating Nazism wasn't "real national socialism" or Mussolini wasn't using "real fascism".
You can't just pretend away bad outcomes from a terrible system when it doesn't go your way. They deployed socialism and communism and the outcomes were exactly what those systems always bring.
Where has this mythical "real socialism" been tried and succeeded? Venezuela? Its also a disaster. Was that not "real" socialism either?
The reality is Socialism has been most effective while being integrated in a hybrid manner with other systems (Social Democracy). Socialism on its own is a disaster that hands over far too much power to the state and doesn't work economically.