Can Myanmar citizens visit Thailand without a visa currently?

NOPE, citizens from Burma need to BUY a visa from the thai consulate in Yangon, before they wing their way here

AND

they need to meet the current entry requirements (100K USD in covid insurance, 15 days paid quarantine in an ASQ hotel, negative RT-PCR covid test within 72 hours of their flight here and a COE from the ministry of foreign affairs)

You need to speak to the Thai Embassy in Myanmar, they'll tell you what the process is.