I think you’re reading too much into it. The connotation is to suggest certain ideologies (racial, religious, nationalist, political) and/or organisations are not thought to be part of the motive.I find some of the wording used in recent times to be a bit odd.
Stuff like things not being a "terror related". It feels like its a term being used to say it wasn't an attack by a foreigner these days. I find it a worrying trend.
People will jump to Islamic terrorism, but the security services monitor and deal with a plethora of ideologies and threats to this nation.
I said this to my neighbour last night, too: do you know Rwanda is primarily a Christian nation, and by a vast majority too? It’s easy to make unjust inferences.