For what? The engine was inspected the day before the flight. The pilots responded exactly as they were trained to do and landed the plane safely.
From the 2nd article:
“Andrea and Kevin Nelson are accusing the airline, as well as the makers of the airplane and its parts, of knowing about possible deficiencies with the plane’s fan blades after a similar incident had occurred in 2016. The Nelsons’ lawsuit alleges the companies involved failed to conduct due diligence inspection and testing.”
“The lawsuit alleges the couple incurred severe physical injuries.”