I'm not sure what WHT is. I 'm familiar with the term "NRA withholding" for those that file a W8BEN or W8BENE etc. If your Delaware entity files a W9 with a valid IRS EIN and current US address, we do not have any withholding. It is my expectation that the owners of the entity will have to pay a IRS tax in some way. You might be better off filing for a NRA refund.
A Delaware entity with a legal US address and IRS EIN# would file a W-9. If you file the W8BEN because the W-9 does not fit under the instuctions in the W-9, you will be subject to withholding. Please consult the instructions to decide what is correct. I can't decide this for you. https://www.irs.gov/pub/irs-pdf/fw9.pdfso Delaware entities are subjected to the same then?