Are there errors when the script runs showing that the topics weren’t created for some reason? I suspect so, but it’s just a guess. If that’s the case, I think running the script again will generate the same errors. Something like the body was too short, maybe totalcount was empty or nil, maybe?
If you don’t see any such errors, if you do something like Post.where("raw like '%some text in post%') can you find the post? You might also look in the post_custom_fieldtable to see if it looks like the post got imported (I can't remember just how those get stored in that particular import scipt--something likePostCustomField.where(value: 'nid:THE_NID_THAT_SHOULD_HAVE_BEEN_IMPORTED`).