This claim is easily defeated by using the same line of reasoning that frustrates the Keynesian inflators:  If printing 1 trillion is good for the economy, then printing 10 trillion must be EVEN BETTER for the economy, right?  If $15 minimum wage is good solves poverty, then a $100 minimum wage is EVEN BETTER, right?

So, if premixing with tx0 "improves Sybil resistance", then premixing 5 times with tx0, tx1, tx2, tx3, and tx4 is even BETTER, right?