Income tax act Article 94 says
If taxpayers are individuals residing in Taiwan, companies don’t need to issue withholding certificates.
I think it means taxpayers out of taiwan need issued statements.
As for the OP’s situation, it was a tax while the OP was a resident, so if you can delegate it to someone, you might not need a withholding statement.
Here is an announcement from a taxation office, telling to whom paperless taxation is applied.