I saw that show too. It also mentioned that Mars’ moon is much too small to stabilize it and its axis moves all over the place. Yet in other shows they have no problem talking about terraforming Mars into a planet with plants, water, atmosphere and all the rest. But it’s clear that it can’t be done with the poles wandering all over the place.
The real problem with terra-forming Mars is that it has no magnetosphere. The Earth’s magnetosphere keeps the solar winds from blowing our atmosphere away.
Earth and the moon are really more of a dual planet system.
Obviously we can’t terraform mars today but given the rate of our technological advances, who knows what we will be able to do in a few hundred or thousand years.