529 Plan Distribution Taxable Withholding Rate - Non Resident Alien

If a nonresident alien living in Sweden with a 529 plan in the US redeems the account as a non qualified withdrawal, I am trying to determine whether the taxable portion of the withdrawal (the earnings) would be subject to the 30% NRA withholding rate? I was informally told that their is a tax treaty between the US and Sweden that may provide an exemption from  NRA withholding but can’t figure out which section (If any) of the treaty would apply. Thanks.