I bet the user is going by feel rather than blood work or testing (which no one other than meso users seem to use).
Not ruling out his experience- I know that not every compound gets tested but if something does go wrong the best thing to do is contact the lab and see what can be done. Pareto has one of the most solid track records for the recent past for the Canadian market, but I doubt they are perfect.
However, if no one ever complains if there is an issue, then in the labs eyes there is no issue. Pareto does not synthesize their raws, thus it is an area of weakness in QC. But this is evident with every operation, so it is imperative that EVERY complaint is taken seriously and followed up on.