You are right but either the checksum needs to be inspected at application layer or the 1/10^7 was undetected bit flips. At the time I read about general bit fl

You are right but either the checksum needs to be inspected at application layer or the 1/10^7 was undetected bit flips. At the time I read about general bit flip probability over the internet and it was consistent with what I was seeing. Maybe I can find the paper.