That isn't quite what was said on eturbonews.com from which the newspaper report is taken. It said there that Mayanmar Airways wants to buy three ATR72-500s to replace grounded MA60s and identifies EI-REO as being its first intended purchase. It also mentions that additional capital will have to be found to finance its purchase, so it doesn't sound like a done deal.
It certainly doesn't say that all three aircraft would be sourced from Aer Arann, although that is a possibility of course.