I just read the article on vortex generators in the August 2020 issue of Cessna Owner. I can pretty much say ditto to everyone else's comments. I have the Micro AeroDynamics Vortex Generatores installed on my 2001 T182T and I also can barely get the plane to stall. It only buffets slightly and the stall horn is blaring, but it will not break with full back elevator.
I had the VG's installed in 2017 and my only regret is I did not have it done 15 years earlier. The margin of safety is well worth the expense. Besides, it is a lot of fun to just "hover in place" let alone make a CFI mad during a BFR because it will not stall.