Earlier quoted context omitted.
Well it's an inescapable fact that anything alive is going to die, and likely be eaten. Basically all animals, and even plants (living creatures too) are going to die horrible deaths, being ripped apart by predators etc. We too, will likely be food for worms. The point he is trying to make is to celebrate the life of whatever you're eating by at least making something special out of it an enjoying it rather than turn…
It's a weird way to celebrate a life when you do it after killing it for your own pleasure. We should aim at minimizing pain, not at creating feel-good rituals for our meals.
The context was, even killing plants is wrong, so we should cook and enjoy those to the best of our ability.
You can say "plants aren't self-aware" or something, but there's no way out of it. Plants might even be home for insects or other creatures which die when you take the plants. Plants are living organisms and you shorten a beetroots life when you tug it out of the ground.
I think the point still stands. Be grateful for each meal and do your best to enjoy and savor it. It's not about "celebrating killing" you injected that into it. It's about showing respect.