I also pour beer (multi-talented, I know) and my opinion is yes, it is beer. Most common types of beer are between 3% (typical mid-strength “crisp” beers start

I also pour beer (multi-talented, I know) and my opinion is yes, it is beer. Most common types of beer are between 3% (typical mid-strength “crisp” beers start here) and 7% (typical IPAs top out here), but you also have light beers down at 2% and imperial stouts up at 12%. Specially brewed craft beers go as high as 20%, I don’t see why it would stop being beer if you go as low as 0%. Where this might get contentious is that zero alcohol beer is made the same way as beer but doesn’t serve the same purpose (inebriation), while oat milk is made a different way to milk but does serve the same purpose. I’m of the opinion that you only need one of the two out of {same purpose, same production} to use the same name.