If you read that section, you'll see I'm not discussing the character, but the material.

It's been several years since I wrote this (or rewatched the episode) but my recollection is that there's a brief mention of the material amber in the episode, and some of the other commentary at the time wondered about that and why it got mentioned. Hence my spending a paragraph or two talking about how it is actually used in a number of witchcraft traditions and how that isn't a bit of "Wait, that's really off" in this episode.