I've always been bad at math, I failed precalculus multiple times in both highschool and college, I never got past my first year of calculus in college, I wasn't able to pass descrete maths, and I never took an algorithms class but, never the less, I am applying statistics to novel problems at my day job and people are lining up to work with me and my career growth is accelerating faster than those around me who certainly got better marks than I did.
How is this possible? I'm not entirely sure, however, it indicates that academic tests don't actually measure ones ability to apply themselves and their knowledge to real problems that people actually have outside of an academic setting (i.e the real world), which I believe is the primary point in the "anti-testing" narrative.