Often the effects of poor aquarium management don't manifest themselves in the fish for months or even years. Internal organ damage to a fish, how can most of us know? But we accept the advice of those who do, and treat our fish accordingly. This individual and others like him will say their fish are fine, this works, blah, blah...then a few months from now the fish will die, but this person will not understand that it died as a direct result of poor care, and had the fish been in a suitably-sized aquarium with a proper environment and water parameters it would have lived much longer. We can only slog on.