I think there are two things going on.
The first thing is that your public feed only shows posts from Oct 6, 2022 and before: https://mastodon.radio/@kj7t Not sure where your newer posts are, but even your home instance does not show anything after Oct 6th.
My second observation is that your instance seems to have disabled queries for users that are not logged in. The plugin would load data from https://mastodon.radio/api/v1/accounts/123456789123456789/statuses I only get “{“error”:”Record not found”}” instead of data. Also could not look up your user id directly on your instance. That means that only website visitors that are logged in to mastodon.radio with a valid user account can see feed data on your website. Most likely most users would not see any posts. You can test this by visiting your site in an incognito browser window.
I tried fetching your public feed through another instance (in my test mastodon.social) which is not ideal. I would recommend only going through the original home instance always, but wanted to see what happened. The interesting thing is that it only shows posts up until September 17, 2022. You can see for yourself here: https://mastodon.social/@[email protected]
My conclusion is that mastodon.radio sadly is not suitable if you want to use my plugin, as the public API is not available. You could try to kindly ask the instance maintainer to enable access, but they might have a reason why they disabled it in the first place.