-
How would one possibly know? ...unless you watched the carbon being laid and knew what you were looking at, or perhaps an x-ray?
The thicker, less dense carbon on these and older big brand bikes is tough, quite resistant to knocks etc compared with thin, high-density layups on top-end bikes. It is also heavier, less stiff and cheaper to build.
What leads to problems/failures are design faults and less than perfect practice when laying up – not something you can see.
This is not supposed to read as dismissive of open-mould frames at all, just an fyi.
How well is the carbon layered around the stress points? How likely are these to explode when ridden?