I have no doubt that outpatient treatment is possible, but that's not the issue here. This article actively encourages people to avoid seeing their vet. Using an outpatient treatment plan under a vet's supervision to cut costs is one thing, self-diagnosing parvo and attempting to treat it with lemon juice because the internet said it's okay is another matter entirely.
I wish we could do something to stop the spread of anti-intellectualism (because that's really what it boils down to: you know things that I don't understand, therefore I can't trust you) in this country, but any attempt at educating people gets written off as vets being selfish, money hungry, and on the take with the pharmaceutical companies. It's ridiculous and the animals are the ones who end up paying for it in the end, but I don't think we'll be seeing any less of this line of thinking anytime soon, unfortunately.