I took a job abroad after coming from the U.S., and updated my LinkedIn accordingly. Soon after, the spam shot up through the roof. All of the same, non-descript, no-details contacts the author describes. It's been striking.
Before I torched it though I tried a little experiment. I left my tech skills in place, but also added things like "Blacksmithing" and "Former POTUS" as my skill set. I also said "Do not contact me" and "I hate recruiters" and something along the lines of "if you contact me, you clearly didn't read my profile" - the spam seemed to increase for a while before I finally deleted the profile completely.