Vent pipe under condo kitchen sink backflowed sewage. Builder negligence?

The main line in a four story condo building clogged with roof debris after a wind storm and sewage backed up into the kitchen of a unit on the third floor. The sewage spewed out from under the kitchen sink via what I assume is a vent pipe. It's an open pipe slanting upward. The plastic dishwasher tube is placed into the opening of this tube. The sewage poured from this open pipe while the owners of the condo were away on vacation (figures) and covered the kitchen floor, cabinets, and behind cabinets with class 3 black water. A remediation company is in the process of ripping out floors, cabinets, and baseboards.

Has anyone heard of or seen this type of "piping"? Did the builder cut corners? Is there something missing (backflow prevention valve of some sort)? Apparently this code, but to allow sewage backflow into a home seems terrible. Condo building was built in 2006 but let unfinished until 2013. Developer rented units as apartments until resold as condos in 2017. Location is in Boulder, Colorado.

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