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And your article was shown to be only a master's thesis --

Oh, that's all it was. (eyes rolling)

which described the undesirable and deleterious effects that a missile in a mechanical spiral has on guidance systems.

That is absolutely false.

Problem areas include possibly excessive nozzle gimbal rates caused by the feedback controller and the need to change the initial kick angle if the missile is spinning in order to achieve the same burnout conditions as a nonspinning missile.

Pretty clearly the author is describing an expected condition and comparing it to another type of missile.

Here is another article about using rotation of an ICBM to minimize its vulnerability to laser weapons.

Thermal Effects on a Rotating Missile

Here is a paper on using spin to stabilize missiles.

Spin Stabilized Impulsively Controlled Missile (SSICM).

Here is another paper on spinning missiles in the boost phase.

Boost Control Design for Spinning Missile

Here is another article that mentions purposely spinning an ICBM during the boost phase.

National Missile Defense Based on the Airborne Laser
"There are several countermeasures that the attacker might use to make the ABL’s task more difficult:
* Spinning booster: By spinning the entire missile during boost phase, the offense can reduce the time the laser beam can dwell on a specific point on the missile. This will increase the ABL’s power requirement, which must be met by increased dwell time or a more intense beam."

Can we now dispense with the utter foolishness that ICBMs (why only ICBMs? other missiles spin too) don't spin?

That was nothing but a red herring anyway since a missile doesn't have to spin to leave a corkscrew plume. The video linked above of the Delta II rocket should have made that obvious. It doesn't spin AFAIK but it left a corkscrew plume at one point.

You have to watch these guys, Arthur, they are major BSers.