Risking an over-invested post from the past <woooo!> but i can kind of see the (admittedly) tenuous rationale behind this.
Those of us that habitually cook from scratch are fully behind the idea that fat/dripping adds flavour to a stew that can never be exactly approximated with "plant-based" ingredients, no matter how fancy. Dripping and saved animal fats are the essential backbone of the kind of peasant cooking i *think* she's trying to hack (in her current incarnation). A diet consisting of 90% "plant-based" (aka plants!) and 10% animal based (especially if that animal is a pig, but that's heading into Goode Life/HFW territory that JM wouldn't feel safe treading, IMHO) is moving in the right direction...
So by providing 10% animal fat she reckon's she's cracked it. Except the animal fat should ideally be from a free range/high welfare animal, and preferably anointed by herbs and/or spices eg. bay or rosemary, as it would if it was leftover from a roast, eked out over the week, in traditional peasant fashion.
Jack wishes buying a block of fun-price lard is a shortcut to those types of depth of flavour.
<Hint> It's not
Sorry, I got massively too interested in food then <slaps self back to consciousness> meanwhile, what wild-lard-chase is JM embroiled in, and do you have receipts???