This was said in response to an organised NRW protest abusing and insulting the Prophet Muhmmmad (saw) and it was said by someone who is out there in the land of jihad himself. That demonstration turned violent and provided the impetus for the clampdown. I'm not sure how much contact and involvement the German salafis have with Yassin Chouka, but the German authorities have been itching for months to clamp down on them and their Quran initiative dawah.