While ADG offers a variety of ways to exclude products from your promotions, at this time, we do not offer "product tags" as one of those.

A great workaround would be adding those specific products to a collection and setting your promotion trigger to include all collections except that collection.
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You can use this article from Shopify to learn how to create an automated collection.

Please let us know if you need assistance setting up any triggers or promotions. You can access our support team from within this chat widget or email.