After hours of fighting to get this to work, it was just a matter of changing delete_posts to delete_post.
So, in it’s entirety this would be:
current_user_can('delete_posts', $post_id);
to
current_user_can('delete_post', $post_id);
current_user_can does accept a second parameter. Though it’s weird that the function declaration in capabilities.php does not define a second parameter as pointed out by @amit. May be someone can clarify why it is so.
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