yes. More than sufficient to break an anchor loose if it wasn't particularly well set or in poor holding ground.
It's very sad to see these folks taken out like this - always and of course.
They must not have been particularly experienced, or were somehow in a bad spot for some reason. it's a very bad situation to be on that sort of lee shore with only a small bit of chain/rope/metal between you and boat-munching cliffs; something no one with any experience - and even many without much experience - would recognize and work
very hard to avoid. No way I'd be sleeping while anchored a short distance from that kind of lee shore for sure!
but - there's always more to the story. in this case, 3 folks died. very, very sad. I hope the other three recover fully.