[kayodelycaon]

If you read the whole article, the building was demolished afterwards due to be structurally unsound.

[dredmorbius]

Adverse-event construction codes are generally intended to provide survivability for occupants, not continued use of the structure itself.

You'll find that this is the case for, e.g., earthquake construction codes in seismicly-active regions.

Structures can be rebuilt. Humans are a more challenging rehabilitation challenge.

Though the Joplin facility was demolished, and five patients died, those were due to loss of power, and not from tornadic winds or debris themselves.

The building performed as intended, even under a direct strike.