Your code is fine to me, except you made a mistake here:
template_redirect('/product/channel-mcgilchrist');
WordPress does not have a function named template_redirect, only a hook with that name.
So you should have used either wp_redirect() or wp_safe_redirect() which are valid functions to perform URL/page redirections in WordPress.
wp_safe_redirect( '/product/channel-mcgilchrist' );
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