Sounds unnecessary to me. If the slats jam after landing, no big deal. The system will certainly put up fault messages, and you taxi to the gate. Maintenance will then deal with it, there is no affect on that flight. If the slats jam on the taxi out, you RTG and once again, Maintenance will deal with it.
“This condition, if not addressed, could result in insufficient lift, resulting in inability to maintain continued safe flight and landing," the FAA's AD says.”. Yeah, well, duh... Has there been any instances of slat jams in flight due to ice and snow contamination?
The whole thing doesn’t make sense to me.