Who actually is Luxenberg?
Christoph Luxenberg needs no introduction. He is a Christian (Syriac priest?) scholar of Lebanese origins specializing in Semitic philology, who has spent a good amount of time teaching in Germany (presumable retired by now).
His monumental
Die Syro-Aramäische Lesart des Koran (Berlin: Verlag Hans Schiler, 2004, 1st ed. 2000), first published in 2000, ignited a storm of controversy in academia. and in the media as well. Therein he argued that the Quran was not written in Classical Arabic, but was originally written in a so-called Aramaic-Arabic
mischsprache (‘mixed-language’). A lot of opaque words, passages, and sometimes entire chapters, in the Quran - according to Luxenberg - can thus be rendered sensible if read in Syriac, and not Arabic.
A clarification is in place. The term Syro-Aramaic used by Luxenberg is nothing but his own concocted technical nomenclature. He is basically referring to Syriac, and the Edessene dialect of Eastern Aramaic, to be more precise.
You can access his book here:
https://goo.gl/uD2Tek