This article suggests Brewdog, plus Thornbridge and Adnams are all brewing to 0.5 and are not extracting alcohol.
https://www.morningadvertiser.co.uk...ight&utm_medium=OnSite&utm_campaign=copyright
There are other articles relating to brewing at 0.5% as well.
Why are you so sure you know what these brewers are doing?
Interesting and I stand corrected however within the article it states what is alcohol free.
A typical brewers beer (for the workers) used to be around 1.5% which they traditionally would have had 8 pint a day allowance, 1 pint a hour.