Most vegans would allow an exception for certain lifestyles. People hunting for their homestead aren't going to cause a global issue like is currently happening.
Ideally we wouldnt hunt at all but thats like some sort of futuristic goal. Noones going to tell you to starve your family to appease veganism, thats not the point.
The point is to reduce suffering and abuse wherever possible. Sometimes its not possible.
A couple years of a dear 'gathering nutrients', vs a summer of cultivating a garden and harvesting? Or do I need to include the energy expenditure (energy ingested by the dear minus energy lost to biological processes, vs solar energy collected minus energy expended on building plant mass and energy expended in harvest)?
I was really just pointing out the absurdity of your complaint about the study but you're making this into a fun little digression.
Costs a great deal to own a gun and ammunition, a truck to haul, tools and labor to clean and butcher, and more to store and prepare it. To speak nothing of the labor of the dear to produce the biomass.
Lol we can keep going with this if you want, it's pretty fun.