1.) It wasn’t scoured, it was dislodged from where it was set into the ground and shifted laterally intact. Given the sidewalk’s flat shape, wide dimensions, weight, and lack of surface area for the wind to “grab onto”, this kind of thing is strong evidence of extreme ground level flow, arguably even more so than the shifting concrete pole Tim Marshall photographed and discussed in Parkersburg.
2.) Henryville scoured asphalt not concrete. Genuine scouring of poured concrete is extremely rare.
If you want to pick apart overhyped contextuals like asphalt scouring, trenching, or cars tossed a couple hundred yards, that’s valid, but you’re also being dismissive of contextual evidence that actually is genuinely significant. Keep in mind, this is coming from someone who sometimes gets accused of being too dismissive.