It's the same policy whether it's real meat patties or beyond meat, because beyond beef has the same main ingredient as the feed for the cattle: soybeans.
How much soy does it take to raise 1kg of beef compared with producing 1kg of beyond meat?
Why does that matter? US ag subsidies are for crops. They effect cow prices the same as they effect beyond prices. Beyond is more expensive because it doesnt have enough competition.
Beyond Beef derives its protein from peas, and explicitly advertises "no soy".
You're right. I was looking at the ingredient list of artificial meat and it was mainly soybeans, but I was probably looking at the wrong brand or outdated information.