I restored the xf_thread and xf_post table successfully, and then created a new category with the corresponding nodes from before. I ran queries in order to replace the old node IDs with the new nodes as such:
UPDATE xf_thread SET node_id = 67 WHERE node_id = 60
My forum statistics also don't reflect the threads or posts being restored. I know this could be perplexing but does anyone know how I might fix this?
I'm reaching the end of my chain on this mistake.