AirResearcher
Quite why you do this, I don't know. When writing papers, referring to independent and separate sources for verification/references are de rigeur but you're on an aviation forum and should post accordingly.
I would have thought that the interim report by the German "AAIB" would have been more relevant (Cause, effect and conclusion?). Especially as Boeing procedures were found to be wanting.
Aside from this, it's an isolated instance of a mistake in maintenance procedures which isn't a Ryanair monopoly as you well know, other depressurisation situations have had far worse outcomes.
None of this alters the fact that Siemens logic appears to be flawed, you don't blacklist an airline because you believe an accident will happen because of it's culture.
Air France should be on Siemens list as the general concensus is they have a culture problem and an unenviable safety record. Perhaps Siemens would like to explain why they consider Ryanair statistically less safe then Air France?