Star botanist likely made up data about nutritional supplements, new probe finds

From the article:

In 2013, Newmaster and colleagues had used DNA barcoding—a method to identify species based on tiny segments of genetic material—to verify ingredients in echinacea, ginkgo biloba, and other substances with purported health benefits. Their influential paper in BMC Medicine, and subsequent work based on Newmaster’s approach, found that many supplements lacked ingredients listed on their labels and that toxic contaminants tainted others. Some stores pulled products from their shelves, and several major supplement companies embraced Newmaster’s work, paying large sums for quality testing by companies Newmaster established just prior to the publication of the paper.

But in 2021, eight experts in DNA barcoding and related fields accused Newmaster of scientific misconduct. In a 43-page letter to UG, the group charged that called data essential to the landmark paper and two others were “missing, fraudulent, or plagiarized,” and said Newmaster did not disclose financial conflicts of interest. Two of Newmaster’s co-authors on other papers were among the accusers.

...

One of Newmaster’s testing companies, Tru-ID, is now defunct, although several supplement-makers including Nature’s Way and Jamieson Vitamins still use Newmaster’s Tru-ID certifications to validate product ingredients. Citing confidentiality rules, a UG spokesperson declined to comment about whether Newmaster will retain his post, faces other penalties, or can appeal the investigative committee findings.

I'm wondering, how reliable is DNA barcoding for food, in general?