It deals with whether the building was built according to the plans which were submitted - not even whether or not those plans are safe!
Tofes 4 (COO) isn't issued until the fire department checks the safety. It doesn't have direct impact on the bleachers, but it is another breach of safety laws. Luckily, that one didn't lead to any casualties. I believe it may have indirectly caused the entire event being illegal and therefore no police/municipal safety checks, but I am not sure exactly how those works.
Is this really important to share? Was anyone missing anything in their lives without this information?
Yes. It's important to know that after 2 major tragedies in a month there is justice and people should think twice before breaching safety laws, as is being advocated on these forums. We care about preventing the next victims more than protecting the perpetrators.