Well that was made clear in the preliminary report published in 2018. If the BAZL were derelict in their supervision I would expect an investigation to be initiated earlier...
You are too optimistic about the awareness and speed of the Swiss government. They are not any better (or worse) than other governments. This department is run by a very nice lady who probably does not know the difference between a knot in aviation and in stitching. They probably only reckoned something was amiss and got shocked when they read the pre-release of the final report.