Nah, I don’t think many alu rims would have perforated like that, in that strike, alu is strong for that sort of thing, carbon doesn’t like edges so much. (and it does look like a proper axe-blow of a rock strike)
But on the other hand, the blow that killed that Flow Ex I mentioned up the page probably wouldn’t even bruise my LB carbons (based on experience of beating those up just exactly the same)- it folded/squashed with a big flat hit, carbon’s good at that. The 2 materials aren’t just stronger/weaker, they handle differently.
The thing it always comes back to with me is… That LB rim I broke? It’d done an EWS round, half a dozen SES rounds (and 2 glentress sevens and a cyclocross race!), and tons of tons of Just Riding Along. I eventually busted it on the hardtail at BPW, by doing something plain stupid. And it weighed the same as a Stans Olympic. That’s fairly ridiculous.