The Thai Revenue Department has published guidelines on what constitutes a remittance. The act of “ bringing into Thailand” funds by any means, whether electronically, by apps, through third parties, ATM withdrawals, via debit or credit cards, physically via cash, gold, etc are all classed as remittances for tax purposes.
You have a few things confused. The fact that you do not have a Thai bank account is irrelevant to your Thai tax liability position. The fact that you pay US tax on your income does not prevent Thailand also taxing your US income when you are a Thai tax resident. The fact that you are not bringing in income into a Thai account is irrelevant. The facts are that you are bringing in funds into Thailand and that may attract a Thai tax liability.