Interesting. Looking at the federation content, it seems that Wordpress doesnt federate the post text at all, only a summary with link to the post. So theres no way for Lemmy to show anything more. Seems like they only considered federation with Mastodon, nothing else.
You can see it with curl -H ‘Accept: application/activity+json’ https://www.informapirata.it/2024/01/02/is-it-possible-to-publish-posts-about-lemmy-from-your-wordpress-blog/ | jq