The blog article is a half-truth.
It states only one position: Wearing a helmet while riding a motorcycle can contribute to hearing loss.
What it doesn't do is:
- Test wind noise on an actual motorcycle. The tests were done in a wind tunnel
- Test wind noise without a helmet on and compare with a helmet on
- Mention anything about (much less test) wearing hearing protection aside from "helmet manufacturers [...] design quieter helmets"
I don't think any reasonable person would suggest that motorcycle riders shouldn't wear helmets.
As to the chart linked to in a previous post, it's on a page offering "Mobile Hearing Test" services. The journal referenced in the blog post you linked to may be independent, but the same can't be said for the providers of that chart.
I, for one, would wonder at the point and purpose of posting such an article. In and of itself it's interesting, but without the comparative tests above, the data is practically useless beyond "maybe they can make helmets quieter". Show me that helmets are louder and cause more ear damage than not wearing a helmet and you would have my attention. Regardless, earplugs are certainly recommended, and I do use them.
"Isn't that a daisy?" -Doc Holliday, "Tombstone"
2011 Victory Cross Roads
2003 Suzuki Volusia (traded in)