The paper describes a potato puree, so presumably they're expected to cook+mash+season the potatoes the day prior and put them in a reusable food pouch. Definitely cheaper and probably more pleasant tasting.
You're clearly not imagining a pomme-puree, from a decent potato, dollop of butter (hopefully with some sea-salt), decent coarse grind of Tellicherry black pepper...
...I'm always bemused that consumers of "sports supplements" seem to delight in them being processed to shit (and are often eaten the same people who'll get picky over the provenance of restaurant food).
And I’m glad I’m not imagining it because room temperature butter that has congealed and separated from a starch sounds awful to eat while you’re strenuously exercising. Bemuse yourself to your heart’s delight - savory, buttery, starches don’t sound like a good idea when the blood has been shuttled from your digestive tract to your skeletal muscle and your body heat is several degrees above average.
you have to eat more of the potato per calorie than the gel. I'd much rather just shotgun a gross gel packet for 100 calories and taste none of it than have to slog through more potatoes.