It takes a lot more than some obscure hipster "I'm going to prove everybody wrong" contrarian's paper to outweigh the massive cases of people fleeing communist countries when they get the chance. That's not refusing to look at evidence; it's recognizing the relative informativeness of different data points.

If you want to prove that communist economies were so much better than believed, you need to directly address the imbalanced migration, not just cite self-reports that assure us everything's totally awesome there.