True, but that is what the whistleblower warned. He said the planes would fail randomly after around 10-12 years approximately.

He was a quaility check engineer at the assembly lines (or sth similar) where the workers were forced to assemble too quickly which caused a lot of small foreign bodies (residue) to enter components with wiring that would degrade due to this.

He also said that would degrade those components much faster than expected and told to the airplane operators causing less checks and earlier failure (than was told by Boeing)