This quote doesn't explicitly state that the 10-15 million will die from COVID but its certainly implied. That doesn't sound like it makes any sense at all though. 20% of the population? Why would Myanmar see 2-3x the global death toll on its own? I don't think there's any data to suggest a 20% death rate even with 0 medical treatment at all (and assuming 100% infection).
Is this just someone getting trigger happy with an exponential model?