1st off labor force partication is easily manipulated by women joining the work force in the 70s / 80s

That would explain the increase but not the decrease. Have Americans started having more babies, requiring one parent to stay home, thus leaving the workforce. All evidence seems to be the contrary.

plus all of that is taken with polling by the government.

That would hold true for most statistical analysis on a macro scale.

If you feel AI is a job killer, in my mind that is the same as saying automobiles were job killers because the horse industry would suffer.

I would say comparing anything in the digital era to 100 years ago is going to be off base. Sure you can point to an industry. What we are seeing is not industry specific. Entire industries may or may not get replaced. That said, employees across most industries are going to be affected, especially if they look at a computer all day.