Utter BS. That you are from Germany and cannot see through this is shameful.
There has been no official statement made in this direction whatsoever. Not from the criminal investigation office, not from the interior ministry, not from the prosecution department. This "news" about the guy's motives is entirely a product of a journalist working for the FAZ. A newspaper which has spread more lies and distortions regarding the migrant situation and Islamic terror in the last months than I am willing to count.