The Trion is mentioned there because of how expensive it is on its prices, along with the huge amount of pro kit cards it needs. On top of that, it is still slower than the 2016 Camaro, HTT Plethore and Renault Sport. Until the Devel is available, its anyone's guess on how much faster it will be over the current class A/S cars.
I do know that the Trion is currently the fastest accelerating car and as much as I want to have one just for the sake of having it, the 4 million buying price would be better off spent on something more worthwhile. Its why the Lykan is still my preferred class S car because of how cheap and useful it is, and while my Ultimate Aero is close to max pro, its useless in SP and MP.