I don't see where Merc and RB are getting those numbers. Ferrari would have to be losing massive amounts of time in the corners to be nearly a full second up on Mercedes in the straights with Bottas only .156 off the fastest time.
Meanwhile, Verstappen was quickest in S3, and even without the tow there, he would've been hundredths or thousandths off the best S3 time.
That said, Ferrari definitely still have a straightline advantage in Brazil.