Sustenance doesn't mean "the only thing available".
Look, I'm excited for lab-grown meat. I've reduced my meat consumption significantly over the last year or two. I may not be "in your camp" exactly, but I'm an ally. And it's probably better to earn and keep allies than to argue semantics in an adversarial way. Win more flies with honey and all that.
I assume you agree o the general statement "Animals shouldn't be killed for pleasure."
If you then have two options for food, one including animal meat and one without, all other things being equal, even nutrition wise, then how is it not "for pleasure" to chose the option with meat?
Absolutely, the biggest nature lovers in my family are all hunters, they enjoy being in the woods, they enjoy seeing animals, they follow the rules to only harvest as much they are allowed and only during the season permitted.
It's usually not that much extra effort to take the carcass and bring it to a butcher, so they do that sometimes. But yeah. Often, just leave it.
It's actually not all that bad because we have a lack of natural predators (because we already hunted them almost to extinction) so hunting keeps the deer population from exploding.