Risk. Boy, there's a lot packed into that term. Here are my disjointed thoughts:
1. The route doesn't look too bad to me. It's hard to ascertain the real angle and slide potential from the GoPro and my clicking through the video instead of watching the full 25 min. But avy danger looked minimal (probably a lot of freeze-thaw cycles) and the slope didn't look THAT steep to me. Likelihood of a fall seemed pretty minimal. I thought the person relentlessly self-belaying across that one cornice section was wasting time because s/he was slightly gripped (with fear). But again, hard to tell from the GoPro. Perfect weather, and a very fast exit possible if needed.
[Begin a bunch of only tangentially related thoughts]
2. People take SERIOUS RISKS all the time in the mountains. Years ago I thought climbing Washington solo in winter was unquestionably dangerous and probably reckless. Then I moved to CA for 5 years, made friends with a bunch of people working through various climbing and mountaineering objectives, spent a lot of time on SummitPost and CascadeClimbers, and read about and saw people doing things that had been unimaginable to me. All of that risk became normalized, and I did a few climbs myself that were quite scary for me (coming down Rainier, roped up on a steep section of Winthrop Glacier just above a massive crevasse, for example. And some really dicy sections of Cassaval Ridge on Shasta. And some stuff in the North Cascades. And some rock routes in Yosemite on trad gear that were near my lead limit). That scariness started to feel normal. I kept living through these experiences, so (I thought) no big deal. Then people I knew started having serious accidents and dying. And then I started reading more accident reports from routes I had been on. In broad strokes, my mental state over the years changed from, "Holy s***, all those climbs are sooooo scary!" Followed by "Meh, that's all totally doable, no biggie." To (now): "You know, that really is risky, and that's just not for me."
3. People do big, hard routes with razor thin safety margins all the time, and some of them die. That is the truth. Quantifying risk is a flawed process once you get into 'no fall' territory. That's because it's really hard to predict if/when you'll fall if you're doing something challenging. You really could fall at any time once you're at a sufficient level of challenge, and you really will die if you do. And that happens all the time, and it's really a bummer when it does.
4. I don't take a lot of risks these days. Anything where 1 mistake = death is just too risky for me. That limits me and I'm ok with it. There's still a lot of adventure to be had. You are the best judge of what is too risky. Don't rely on anyone else's assessment.