In Chapter 2 of Alas, Babylon, what part of Mark's warning might be considered dated?

We must remember that to our mind, coming from the 21st
century, the majority of the scenario that Mark unveils to his brother in the second
chapter of this excellent novel is going to sound very dated. Clearly, we need to
remember that this novel was written at a very specific point of history, one that we
have left long ago, and that now weapons technology has advanced to a massive extent. In
particular, we might question the way in which Mark paints a picture of the Russian
strategy of firing missiles so that they all arrive at their targets at the same
moment:

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Time-on-target. You don't fire everything at the
same instant. You shoot it so it all arrives on target at the same
instant.

Nowadays, such a
strategy would be impossible because radars, satellites and sensors have become so
advanced that the moment a missile was fired we could detect
it.

In addition, the world now is so much more
interconnected than it ever once was, meaning that the Cold War scenario of Russia vs.
the USA is no longer tangible. Truly a nuclear war, were one ever to happen, would
destroy the whole earth, not leaving swathes of the USA and other parts of the world
left unharmed.