It's unauthorized/unofficial. We could possibly make that clear in the /about page, though I think people are probably used to it from the many HN* projects around.

The show is certainly aiming to be based around HN though, not just a general tech show riding on HN's name. Guests are HN regulars and stories are those popular on HN.

While not run/authorized/curated by YC, there was a community-wide discussion about the want/need for a podcast of this sort, and the community seemed to answer with a resounding "yes." Hijacking is the wrong word, it's a podcast about HN, so the name is simply relevant.

Although I guess they could be more clear about the "no affiliation" thing.

Judging by the about section, I'd go with they aren't authorised.