“Edit: [weaver_show_posts] is a major exception – it must be manually converted to ATW [show_posts].”
I am unsure whether the string to include in a post is “ATW [show_posts]” or “[show_posts]”. A test will tell me what works, but I hope that the rest of the instructions are more specific than this. (I’m aware of the plugin-whose-name-was-ATW, so I recognize the likely meaning)