Yes, that's what I said, but people with jewish mothers would be jewish to jews and raised as jews - therfore these Mischlinge people are paternally jewish, which means they could not, as Larry suggested make Aliyah. If their mothers or mothers' mothers were jewish, they would be jewish according to Halakha, and not Mischlinge.
If there were as many Jews as Rigg suggests then chances are at the very least several thousand were Jews on their mother's side. Chances are at least some were not raised as Jews and even if they were raised as Jews they could still have managed to get into Hitler's army.
My sister-in-law was born Jewish, converted to Christianity, married a Baptist, raised her two daughters as Christians, and the oldest just married a Christian.
Would you consider them Jews?