I don't think they can use this method with Thailand banks.
UK banks issue you with card and PIN, posted separately, there is no option to change the PIN at the ATM. Thai ATM PIN numbers are registered on the card when you activate a new card at the bank, you enter your own PIN, you can also change your PIN at the ATM. Thai banking apps don't have the same option UK banks have to send a PIN reminder.
But it's worth taking the advice given in that article and disable notifications on the lock screen.