Initially Thai immigration wanted the embassies to do "income verification" UK, USA, AU instantly said No Way Hose.
Thai then dropped the verification.
Response: Nup.
FWIW: I had a chat with an Oz lady working at the embassy.
I asked about this and (according to her) Oz embassy was basically providing a statuary deceleration.
Think USA use word affidavit.
Anyway she stated those can only to used for purposes inside Australia.
So the story went.