Ashamed to say I never ended up publishing the post. Meant to, and was grateful to Karl for taking the time to chat with me, but I kept getting buried in work and never got around to transcribing.
Don't know what's happened to him, unfortunately. He had some website issues when I talked to him a few years ago and was looking for a new webmaster. Maybe those issues came up again? He's on Instagram and you can try reaching out to him directly. Account hasn't been updated for a while, but perhaps he'll respond.