It really is more in the how than the what.
It was "oh by the way wink wink". If you want to make a point about Islam, just say it, don't dance around it.
Oh, come on. Surely you must have noticed that these lunatics have a penchant for screaming "Allahu Akbar" at the drop of a hat.
One must assume that somewhere Islam is involved in their thinking. To pretend that there is no connection to Islam worth noting is somewhat bizarre. To cast aspersions on folks who notice this penchant, as if there is something wrong with their taking note, is inane, if not outright dangerous thinking.
Besides, noting they yelled "God is great" while merrily rampaging the area adds a certain "
je ne sais quoi" to the comment. In simpler terms, "A group of deranged fanatics stormed a building, killing many occupants, while yelling God is great."
You don't think the utter starkness of the contrast is worthy of note? Seriously?