Quoting your source: The watertight condition of the ship was guaranteed by the 13 watertight bulkheads. Seven compartments were damaged as a result of the collision but initially the ship remained afloat. No one intervened to break the chain of errors.
See also: https://www.aibn.no/About-us/News-archive/Status-of-the-inve...
The vessel grounded and continued to take on water, through the propeller shaft and stuffing boxes.[9]
The whole point of stuffing boxes was to contain water in damage like this.
The link you posted is in no way absolves the shipbuilder. Merely states that
The vessel's Spanish designer Navantia received a notification of a critical safety issue in relation to the frigate's watertight compartments
…and the investigation is ongoing.
That is not the point of stuffing boxes. They keep water out when the shaft is not turning and lubricate the the shaft with sea water when it is. A grounding can bend the shaft easily letting lots of water in.
The AIBN considers:the vessel's lack of watertight integrity to be a safety issue relating to Nansen-class frigates and therefore issues the following two safety alerts
https://www.researchgate.net/publication/330180246_Analysis_...