It doesn't say whether it has to be a current account or a savings account. All they want to see is that you have either 500k THB in a Thai bank account or equivalent in a foreign bank account.
All anyone has to do is inform their bank that they're going abroad, including days you'll be out of your home country and tell them which country/s your going too. This applies, well in my case to transferring money.
I transferred money through Wise December 2023,from my UK bank account, to a Thai bank account that is a Thais account. I used my banking app., with Surfshark and no problem.