A variety of buildings have collapsed in China in recent years. Here's one good example with great pictures. I don't know if it's the same company or not.
And that's not a 90 day pre-fab building. IIRC, they had a dodgy underground carpark, which subsided. It had nothing to do with the actual building.
Also, the pre-fabs they are starting to build have a lot of steel, which is easy to engineer. Concrete can be more difficult to get right, especially when you don't trust the suppliers (bamboo rebar anyone?).
But concrete buildings are so common in China because they can be assembled with low-level migrant workers. The move to steel typically requires much higher-level expertise, and so only the tallest buildings get that treatment. But with prefab, this is interesting, they might be able to continue using low-level migrant workers in the factory and during assembly?
I'm not sure exactly which incident you're referring to as there have been several of these stories coming out of China in the last few years, but as far as I know none are associated with Broad Group. They pride themselves on being safer than other Chinese builders because of the tests they can perform on fabricated pieces– obviously that's what they'd want you to think regardless, but from what I've read it certainly seems to be the case. Chinese construction on average isn't great, and they appear to have their own process down pat even if it misses out on some more exciting design features.
