Mostly true, and good for me to the extent it's true (as a native English speaker), but it does depend on the field and country. A lot of robotics and EE research in Japan is published in Japanese-language journals, as one of the bigger remaining outposts of non-English technical literature. The journals are slowly moving slowly towards more English, at least to the extent of publishing English abstracts for the Japanese papers, and younger researchers will tend to publish more in English, but it's a pretty recent trend.

There is a lot of media-art / media-philosophy / electronic lit stuff published in German as well. E.g. I would love an English translation of any of Claus Pias's books, or of this generative-art book: http://www.generative-gestaltung.de/about