Presumably the military assumes that radar altimeters can be jammed. The potential problem here is that they might be jammed when there is not an actual war in progress. It's a generic aviation thing and is not specific to any one group.
It's still a game of cat and mouse, because the operators either will have enough sources not to care or be clever enough to only paint a target at the last moment.
Anti-radiation missiles seem fun to work on, for example the (now retired) ALARM missile will loiter at 13 km with a parachute then use a secondary rocket motor to attack a target it finds. The signal processing these things do is probably unbelievable.
Thinking about it some more, a radar altimeter is only effective to ~2000 feet so it’s probably going to be a relatively close range highly-directional beam which would make it harder for a seeker head to find but also means you’d need a truck close to the airfield perimeter, painting aircraft on final approach.
WRT last minute painting, I guess the E model would help a bit with that:
> the AGM-88E Advanced Antiradiation Guided Missile (AARGM), features the latest software, enhanced capabilities intended to counter enemy radar shutdown
At 870k USD a pop you wouldn’t want to be lobbing a lot of them, though - as you say, it’s going to cheaper to build jammers than countermeasures to destroy them.
I certainly hope that there's some sort of channel-hopping strategy in place to prevent accidental jamming. In fact, I would hope that "can't be accidentally jammed by a bunch of 14 year olds on their cell phones," is a lower-bounds for measuring the efficacy of the system.
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