Only because he was pushed down nearly onto the white line by ANT, who was fully at fault for causing the collision.
Be ahead at the apex and not lock up. That will help. Those are the rules.
Locked up because he was pushed down onto the white line and kerb by the car that collided into his rear tire. Notice the contact was at the rear and not the front.
He can not drive more inside, even he don`t lock up. It should not make a difference for a penalty. Maybe its the rule but a good racing driver should know not to turn in like ANT did.