I was going by the announcement on this page
https://www.nitrokey.com/news/2015/5-new-nitrokey-models-and... which states, "The Nitrokey U2F is a third party product ..." as well as some historical articles like this one
https://lwn.net/Articles/695438/. I wasn't aware that this was an official product developed by nitrokey. Did this change recently ?