I assumed he was talking about the extension. If I remember correctly, I wasn't required to provide proof of funds at all when I applied for the non-o. Been a couple years but I had already opened a Thai bank account before applying for the non-o from my country.
To be honest, I almost did on my first retirement extension. It was getting pretty frustrating. Now that I'm familiar with it and remind myself I'm not busy 🤣🤣🤣 so I don't need to hurry, it's pretty easy.