Had you read the summary, or the article, or the entire Wiki page you'd have caught that:
1. That they're referring to when a person's "blood alcohol level reaches 0.075" [In the article summary].
2. That the explanation given in the Wikipedia article explains what is meant by blood alcohol level, and notes that it is a term used along side Blood Alcohol Content.
3. The units of measure are interchangeable given the way they're measured, this is why the wiki article gives that handy This much in method A is equivalent to this much in method B chart. One gives a mass per volume, the other gives a volume per mass.
4. There is no mention of blood-alcohol percentage, only the beer's alcohol percentage.
If you're referring to the BrAC in use in some countries as the third unit in use, the wiki article clearly states this is a different unit of measure, and not one that the article mentions at all.