My Hoka Speedgoats are by far the grippiest footwear I've ever owned. Did a Pemi loop two weeks ago in them, slipped like maybe once, just a small bit. I actually tested the grip on wet and dry a bunch of times, and just couldn't get myself to slide down the rock.
Reading the NHFG press release, it sounds like the hiker was heading down from Mt Bond to the shelter when this happened (carried 2/10 mi to the overflow), on day one of three. That means the all the really hard stuff was yet to come. That said, even on an easy hike, I think about how a single misstep could result in a tumble down with fractures or worse. You have to watch every single foot placement.