[RSS Feed/News] can't add page_node conditional in page_container template?

[XenForo]

I'm trying to run a check for node_id in the page_container template to display content in a specific node. Will it not work in that template?
I've tried both:
Code:

<xf:if is="in_array({$forum.node_id}, [x])">
Code:

<xf:if is="$forum.node_id == x">
Neither worked.

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