Says “Unauthorized!”

this is coming from woo-product-disclaimer plugin

The output comes from the already mentioned Woo Product Disclaimer plugin. Since this is a commercial product, I would ask you to contact their support: https://woocommerce.com/contact-us/ – questions about commercial products are not allowed here in the forum.

Thank you for the help! I’ve deactivated and still seeing the “Unauthorized!” message after opening a browser in cognate mode.

You have some caching plugin active in WordPress. You need to clear its cache – then the output should be gone.