Nope, it doesn't have that super shot anymore. Remember, this is a closer-to-codex mod, so all non-codex abilities got axed. What did happen is that the Basilisk now fires the same shell as the Leman Russ, just at a longer range, just like in the codex. However, the Basilisk is capped at three, may become a relic unit, and is extremely expensive at about 400 or so requisition, which is a lot since the requisition researches were removed from Listening Posts. And Basilisks are Tier 3 now. So overpowered to the point of game-breaking? No, not really especially since every other race gets units of pure cheese.
What cheese is their for the races now? Tau Hammerheads now have an anti-everything railgun that rapes everything from infantry to vehicles at a range of 108. Broadsides rape vehicles and heavy infantry at a range of 108 and can fire on the move now with an upgrade. Chaos gets near-invincible anti-everything Obliterators that can fire all their weapons at the same time now, and are no longer hardcapped to one squad, and they can also get three squads of Chaos Terminators. There's also the Defiler which is a cross between a Dreadnought and a Leman Russ now. Space Marines get three squads of Terminators, as well as four Land Raiders, and all those are freaking tough. The SM also have access to an all-powerful Orbital Bombardment that can destroy damn near an entire base in one activation. Necrons are made more codex, and are the only race capable of taking out enemy bases in T1 thanks to their codex-y anti-everything guns. Eldar have access to the Scorpion super-heavy tank which can take more damage than the Baneblade, as well as a superpowered Avatar of Khaine. The Wraithlord also got a buff in that it ignores infantry armor and rolls 10+2d6 for vehicle armor penetration, and is damn near invincible thanks to the fact its a Monstrous Creature and has three wounds. Orks have access to Lootas, which are relatively cheap and are maxed at 12 per mob. Lootas all happen to have autocannons, so you end up with twelve autocannons all firing at the same target, and in FoK they will rape anything short of a Land Raider, even a Leman Russ. Ork Killa Kanz now come in squads of three, and sync-kill every 5 seconds or so. Orks also have access to Deff Dreads which will rape any other walker vehicle thanks to its pair of close-combat weapons. And the Black Templars, a Chapter of SM that don't follow the Codex Astartes, get three squads of Terminators, as well as up to ten Land Raiders.
So yes, the Basilisk is cheese. However every other race has its share of cheese so it all balances out in the end.