Except it now transpires the attacker was himself islamophobic, with a history of ranting about Islam and leftists and spouting theories about Germany encouraging the islamism of Europe, and some media are saying he had voiced support for the likes of the AfD. It also appears that he had a history of talking shit about the group 'Atheist Refugee Relief', who in theory were supporting the same sort of refugees as him, and they filed a criminal complaint about him back in 2019 over the nature of his rhetoric and accusations against them.
Likely the full picture is more complicated than I have the time or info to describe right now, so apologies if the above characterisation turns out to be flawed in some way.
It also seems that the BBC did a video piece about him and his website some years ago:
A Saudi activist has helped hundreds of ex-Muslims flee – especially women
www.bbc.co.uk