Vibrational Analysis

https://www.pinkbike.com/news/doing-science-the-vibration-damping-of-8-handlebars.html
ISTM there is one other rather relevant factor that wasn't accounted for as well - load on the bar. There was no mention of how much weight the rider was placing on the bar on each test. It's likely it was rather similar, but even a small variation in the weight on the bar may have had a significant effect on any resonances.
so
"Was it perfect science? No. Was it nerdy, illuminating, and deeply satisfying to test product claims with actual data? Absolutely."
meh.....