Government Mafia use carbombs, yet nobody accuses them of terrorism.
No, but politically the country is in such a mess that even the corrupt people are fed up, and whoever did this has pretty much put a fuse to a powder keg.
That said, WTF? Selling car bomb assemblies online? Sure, grab the buyers asap but I certainly would want to have the proven sellers moved to narrower confines as well, preferably with one of their products, counting down from a week. "I didn't know the buyer was going to blow things up" is a rather hard sell to any sane judge IMHO.