Basically what @meekah@lemmy.world said: the idea is to be practicable. Here’s a stream of disconnected thoughts about this:

• What you pointed out is actually consistent with how a disproportionate amount of vegans are staunchly anticapitalist.
• A cut-and-dry example of someone who’s still vegan but eats animal products based on “practicable” is someone whose prescription medication contains gelatin with no other pill type; vegans aren’t going to say “lol ok too bad bozo you’re not vegan anymore”.
• The core focus of veganism has traditionally been non-human animals with the idea that a reduction of cruelty and exploitation toward humans is, at most, peripheral. This is changing in my opinion, especially when questions like “vegan Linux distro” don’t involve animals short of what the devs eat.
• Based on what you say (as someone else pointed out), a distro based solely on FLOSS would probably be regarded as “the most vegan” if that were ever measured by anyone (it never would be).
• It’s a weird analogy, but after you’re done using and purchasing products derived from animals, what’s “practicable” from there is kind of like a vegan post-game. Many vegans, for example, won’t eat palm oil because of how horribly destructive it is to wildlife.
• Growing all your own food is in that post-game area of “practicable”. It’s up to you to decide if that’s practicable for you. It’s up to you to implement that if you think it is or, if it’s not, to maybe think about how else you can reduce harm with how you buy vegetables. It’s up to you if you want to share that idea and help other people implement it themselves. It’s widely accepted that it’s not up to you to determine if it’s practicable for others.

as far as is possible and practicable

Its not really practicable to grow all the vegetables you eat on your own. So, to answer your question, no.