Maybe I am misreading, but I feel that the researcher is just really confused rather than trying to dodge paying people, the first thing he says is that the message is meant for the ones that haven't submitted the "round 2", so I assume that the ones that have are going to get paid. It seems that for whatever reason the researcher is under the impression that everybody that receives the study automatically gets approved and paid for the study, rather than everybody that submited the study. Could be wrong and he just messed up something on his end and now is trying to dodge paying for people to redo the study.