@Alastair *****
What you are saying is factually incorrect. There is not a "thin thread of truth" it's the current enforced law in Suvarnabhumi airport since January 2022. Anyone who goes out of Thailand and tries to come back and has a volunteer visa in their passport will be interviewed and denied entry unless you can show them all the proper paperwork which frankly most don't have because most volunteer visas are done with an agent.
Regarding ed visa, it was not always "tested". It's been the case for the last 2-3 years roughly and mostly in Bangkok upon coming in. And up until last year, you could skip 90 days report (agent could do it for you).
Regarding "other entry points", land borders are closed and Chiang Mai has no direct flight, they all stop in Bangkok first. Phuket is probably the second most difficult airport to enter from if you have many stamps in your passport, but ofc, nothing top Suvarnabhumi.