The entire page is a translation of blog articles that already exist in German.

http://www.grimm-jaud.de/index.php/blog/multithreading-in-mo...

Dozens of follow up articles are on the blog in German.

http://www.grimm-jaud.de/index.php/blog

The Author has published several German books on C++

http://www.grimm-jaud.de/

I have never read any of the books or blog posts, so can't say anything on the quality.