Are you really not getting this, or just making straw men? "That's a huge win for the environment (and also animal rights)". The comment seems pretty clear to me.

If it's just straw men... nothing is black and white - the same people who say boo to "synthetic foods" (which is obviously a massive scale too) are not the same people who say "meat production is bad for long-term human survival". The issues are complex and overlap in weird ways.