there is a lot of weird things about what you're saying, but for one:
the same amount or more petroleum would be spend on cultivating food for the to-be-slaughtered animals and transporting the meat around.
I'm not a vegan (anymore), but veganism is still the lesser evil here
for those, like me, who can't remember where they've seen the original image before, it is the necrons from Warhammer 40k :)
https://warhammer40k.fandom.com/wiki/Necrons#Necrons_in_the_41st_Millennium