Yes I'm helping him out by rebutting your statement.
In fact, I was in Myanmar a few months back and last year and VISA cards were accepted at the ATMs I used as usual (this was CB bank).
I hold a Myanmar bank account and since the exchange rates used by Burmese banks aren't good, it's better to transfer funds into your account from abroad using Western Union (Wise doesn't work for Myanmar) or bring sufficient cash and exchange it for Kyat there.
Just to conclude though - in an emergency, someone holding a foreign issued Visa or Mastercard should have no major issues withdrawing funds from an ATM, especially in Yangon. Not every ATM works though. Need to try different ones and stick with the major banks.
Yes I know, through a notary. I've decided to get my company registration documents notarized (there are two), but that's it. Other documents already have signatures and in some cases, stamps on them.