He clearly shouldn't be sending in a W9 Form, which is only for Americans. But it seems most non-US affiliates (being individuals with no US activities) do not need to fill out form W8 either. Even AFF's own FAQ says so, so fuck knows why they are asking for it.
Here's how Google Adsense puts it:
"If you do not have U.S. Activities, please visit the Tax Information page under your My Account tab where you will agree to a statement to that effect. No tax forms are required in this instance."
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