That video is literally about anabolic steroids not peptides. Not to mention there was 0 testing labs in 2012 that users could send their items to, to get tested while there is many now a days. Back then in 2012 unless you had a friend at a University lab that knew analytical chemistry you were out of luck to get anything tested.

You aren't wrong about a lab in China cutting corners, having quality issues and low quality control standards but people don't care if they see 10,000+ people using peptides for decades without a single complaint about infection or real problems.

"is producing something that normally costs such a high amount" the cost has very little to do with the chemicals themself, the cost is about recouping R&D costs and having a 90% profit margin.