On the contrary-- I think that capability would be enthusiastically adopted by a state like Ukraine, which is fighting an asymmetric defensive war against a larger aggressor with logistical advantages. Keep in mind that a "permanent wasteland" as a buffer was in fact the status quo in parts of the east prior to the Russian invasion in 2022, except the wasteland was maintained by human beings at a high political and economic cost. Today, both Russia and Ukraine create permanent wastelands in the form of extensive minefields, passing those costs on to posterity.
The autonomous No Man's Land--a relatively low-cost deployment of a buffer zone along a state border, in which nothing human may move and live--is likely to be the future of warfare in a world increasingly defined by ethnic conflicts, unchecked inter-state rivalries, and migratory pressures.
There are limits to autonomy as well. Presumably they mean these things can find targets and maneuver in real time without continual human intervention, but they still have human operators and someone has to give them a target. My brother-in-law works for Anduril, as a forward-deployed trainer of the drone operators. There are very much plenty of humans involved here. They can't just ship you a pallet of machines that you turn on and then they go fight a war for you.
Also remember that exactly what you're describing (all the grunts are pinned down by artillery and can't move) is exactly what happened in WWI. That didn't mean it was the future of war. Offensive forces adapted. Heavy armor, airborne troop insertion, long-range counter-battery. Having the upper hand in an arms race is never enduring. The other side always adapts.