No - they are not on your statements - sorry, but no they are not.
All I got was an official letter from Fund and ATO Statement that 15% tax is paid on Super earnings for ALL accounts in accumulation.
The DTA is only a possible means to get tax relief here - it is not a certainty and it has to be claimed and accepted by TRD.
But like you - I have absolutely no intention of ever lodging a tax return in Thailand.
If any Expat is caught and gets fined/jailed for a minor breach (not tax fraud), then I and many others will immediately leave Thailand.
Many potential problems - but the biggest one IMO is that Somchai the TRD Official has more autonomy and authority to make any decision he decides, than Pornchai the IO in the Immigration Office. Somchai can decide how much income tax you have to pay based on your lifestyle, house, car, assets etc. You can appeal - but you have 7 days to pay, and only after paying can you appeal - in Thai. Good luck with that.