While yes I made the mistake of giving a single example, I would point out that I’ve never, ever in any supplement, in Dragon magazine or any module seen a single hint that demons need to eat.
No farms, no kitchens, nothing. Not so much as a suggestion that demons require any sort of nourishment.
So no I don’t think it’s ridiculous. What I find ridiculous is people leaning on decades old material from several editions ago that have zero relevance today as “proof” of anything.
Need to eat? To bring in nourishment like you or I, or NEED to eat, pyschospiritually . . . whether it be the flesh of mortals or weird demon crops farmed on the 223rd layer of the Abyss . . .
This argument overall is getting into the weeds and into ridiculous levels of silliness (although I suspect we don't all see the silliness as the same things).
The original argument (I think) was a canon one . . . do demons have gender and/or sexual characteristics? In 5E canon, it's not definitive, but implied that yes, in fact, they do. In the broader D&D lore stretching back 50 years . . . the answer is inconsistent and changes with the supplement. And sometimes gets weirdly specific.
This demon yes, but demons overall, maybe not . . .
But within broad D&D lore (over 50 years), demons, devils, and other spiritual beings are 1) spontaneously generated from the "material" of their plane, 2) or transformed from mortal souls, 3) or corrupted beings into demonic forms, 4) or made by a loving demon mommy and daddy. Sexually. Yes.
Maybe that doesn't make sense to you. Okay. But it's there, like or not.
The argument then morphed into . . . do demons have physiology at all? Do they need to eat? Breathe? Poop? And again, the 5E canon answer isn't definitive, but implied that yes, in fact they do. In the broader D&D lore, again it's constantly changing and inconsistent . . . but it's there.
Maybe that doesn't make sense to you. Okay. But it's there, like it or not.
Ultimately however, we are all arguing about something that just doesn't freaking matter in the slightest. If your vision of demons do not have any sort of physiology, do not need to eat, breath, poop, or have sex . . . sounds boring to me, but who cares? But trying to pin down a canonical answer to the question is a madman's game.
My god, imagine someone asking Crawford this question at a convention . . . I really doubt the D&D team, of any edition, put as much thought into this ridiculousness as is going on in this thread.
And really, you know what the real, true canon answer is? Whatever serves the story at the moment, that is canon. Every "citation" others have brought up in this thread, and that you have summarily dismissed because it doesn't fit YOUR narrative, wasn't an attempt at defining the "ecology" of demons, but simply what the writers/designers felt worked in the moment. That's it.
If you question is, that doesn't make sense to me, convince me otherwise . . . well, we can have that conversation about SHOULD demons have physiological needs. But you frame this as a question of canon, ask for citations . . . and then reject them, move the goalposts, and make ridiculous claims like, "Well, if Descent into Avernus didn't detail demon farms, then clearly they do not exist . . ."
You, my friend, are exhausting to have a discussion with at times.