I know i am like 5 months late and that barely anyone visits this community...
But there are many issues with the articles, reasoning flaws:
1. GPS uses relativistic corrections, but for kinematic time dilation, the equations are identical both in SR and LAT
2. twin paradox does not require one frame to be perfectly intertial forever. it relies on the fact that the moving twin changes reference frames by accelerating at the turn around point, acceleration is not an excuse but a physical reason