Thanks, that is a tiny bit disappointing but not at all surprising to learn. He is a talk radio guy making entertaining content. I wouldn't post that comment in /r/askhistorians , even as a third level comment, but in this more casual sub I'll leave it up.

1/10 is not as much a holocaust as 1/3. Although if somebody wanted to call it a genocide, maybe it would still fit the definition. It's been a couple years since I listened to it, not sure if it had "the intent to destroy, in whole or in part, a national, ethnical, racial or religious group, as such".

Hardcore History podcast has an episode that is available for free, called "The Celtic Holocaust", providing an educational and entertaining listen.