Creditors is used. If I deposit money into a bank I am one of the bank’s creditors. I lent them money and I expect it back along with interest payments.
the Government is proposing to implement a bail-in regime that would reinforce that bank shareholders and creditors are responsible for the bank’s risks—not taxpayers. This would allow authorities to convert eligible long-term debt of a failing systemically important bank into common shares to recapitalize the bank and allow it to remain open and operating.
If they meant depositors, why say "long-term debt"?
They could have easily said "all debt" or "bank shareholders and creditors and depositors".
The OP's claim is weak.