Yeah it's the Hacon API like http://www.thetrainline-europe.com/ use. That is not the raw data but a journey-planning API. You need to spend 15k to become a licensed Deutsche Bahn partner and then pay Hacon per query. But the Captain Train post seems to be talking about them doing their own journey planning from raw schedule data. I just want to know how they got it when no-one else including Loco2 can get it.
Reading between the lines it seems they license the Hacon API from Deutsche Bahn