[Ursus Maior]

There is some validity to that, yes. Hence the large reserves on both sides of the Cold War, but the limited availability: Usually these weapons were only available on corps or maybe division level. Clearance from the political level was also needed, since it would have meant a sizeable escalation.

All in all these weapons would probably not have been used against these kind of strategic locations, since they were out of reach of most delivery systems. A POMCUS site is far removed from the front line. And equipemt hardly cares for chemical warfare. Yes, it might take a few days to decontaminate these sites, but those are targets you want to eliminate early in the war and permanently, if possible.

If you're already in range of POMCUS sites with your 203 mm artillery, the war is over. If you deliver chemical weapons early in the war by short range ballistic missiles, its an immediate escalation and the war could go nuclear to early. Also, German WHNS support commandos would have decontaminated the sites, before US personnel arrives. It might add 2-3 days to the schedule to activate the gear, but that's not the same as physically destroying the equipment.

Additionally, long range delivery systems for chemical weapons are very rare. Ballistic missiles are not very exact weapons until the arrival of NAVSTAR/GPS and chemical weapons need a high level of saturation to be efficient in actually killing enemy personnel, even before we're talking about the effect mostly wearing off due to limited persistence.

If you want to salt the earth, that's what nukes are for, but they work both ways of course and using them is the endgame. But actually salting larger areas of the opponent's territory was not a highly sought after strategy in the Cold War. Both sides, especially the Soviets, knew a Cold War gone hot had to be over in a week to 10 days, a month at the latest. This is how long strategic reserves were planned to last, but actually they would have lasted much less. So, whoever reaches the limit of his fuel and ammunition first, is likely to escalate first, i. e. go nuclear.

This meant that the USSR would have actually had to make true on the ambition of "Seven Days to the Rhine", because after that NATO would either have had more troops, prolonging the conflict, or NATO would have escalated and went nuclear. Completing the blitz through Germany within seven days, would have had the chance to overpower NATO's reaction time, allowing the Soviets to enjoy a fait accompli.

Salting territory takes time to implement, escalates the conflict unnecessarily and slows down your troops. That's three no-gos to Cold War maneuver warfare.