Earlier quoted context omitted.
Right, but beer varies widely in alcohol content. One "standard beer" might be defined as 12 oz / ~330ml @ 4.5% alcohol by volume, but many IPAs are 6-7% or greater, and in most U.S. states you can find lots of beer in excess of 10% ABV.
'''In general getting much above 10-15%abv requires specialty yeasts or concentration techniques, and getting much above 20% is going to require some sort of concentration.''' https://alcohol.stackexchange.com/questions/110/what-is-the-...
Not debating the "specialty concentration techniques" since it's basically infusing the beer with whiskey, but it's certainly very easy to get a beer with an ABV above 10%. Very easy. Your local liquor store likely has several varieties in stock right now.