One thing to note is that although there are currently no posts populated. If you click on "Browse more on the original profile" it takes you directly into Threads. This is normal behavior for this link and does the same thing with Wordpress federated blogs.
@mastodonmigration Hachyderm @hachyderm search for that user passes an SSL certificate validation error through. Betcha Threads’ APub endpoint is still using a self-signed cert.