XF 2.2 Adding conditionals in the author_info in post_article_macro

[JoyFreak]

I'm trying to add conditional statement in the author_info of post_article_macro but nothing is working.

<xf:if is="in_array({$forum.node_id}, [11,12])">
</xf:if>

<xf:if is="$xf.visitor.canStartConversationWith($post.User)">
</xf:if>

Both of these don't work. Please help me.