I fed it an Italian Wikipedia entry and it generated a (relevant) podcast and summaries in English, so at least the input seem to support multiple languages even if the output is in English.
If I had come across something like this 2/3 years ago it would have looked like magic, but even now it’s quite impressive.
Edit: You can change the language following the indications in the FAQ; after that, text generation seems to be in the configured language, but the podcast is still in English.
