I hate to be the one to defend TZM but there are serious fundamental misunderstanding/misinformaiton in this OP's arguements i feel i have to...
TZM doesn't think a supercomputer will create 'infinite everything' or even produce anything, its a means of resouce distrobution. The idea is that if you take all the worlds resouces into account, declare them common heritage to all people, then the process of distrobution of these resouces becomes an objective process, which can handled by a computer model devopled by the experts of the age and processed on said supercomputer.
Furthermore, I don't beleive TZM thinks you can remove scarcity all together , just that you can remove scarcity for the basic requirements for life, food, water, energy and housing. I too beleive this can be achived, but like you i reconize that as we can not remove scarcity all together, there will always be a need for some form of currency for people to exchange with for those fringe needs.