I’m surprised by your results. In the thread you linked previously, I reported having lost 5% of files on a Node, and it hit the dangerous score of 70% at some point.
But because it was very young, it was still receiving data, and little by little the percentage of lost files decreased. I thought that was the reason it did not get disqualify.
I would have thought that 10% of lost file would have been a high way to DQ for sure! 
Statistically I guess you’re right, although if the node keeps growing, it means the percentage of lost files keeps decreasing, reducing the odds of getting disqualified (like my node did: Today it rarely fails audits, but still does time to time which drops the score around 94% before going back up in the following days).
And… Surely some advanced statistical models determined that the current audit system is robust? Data scientists know better, right? 