W-8Ben and IRA early withdrawal penalty

If I understand correctly, as a non-US person living in Japan, I can file a W-8Ben with my US brokerage and should owe 0% witholding on traditional IRA distributions, then I only need to pay tax to Japan.

Does that include the 10% early withdrawal penalty? Or do I still have to pay that if younger than 65? I can't seem to find this discussed anywhere

by Naomi_Tokyo