With all due respect, you can disagree if you like but
@Jarne and others are factually correct; tigers being solitary creatures is not unambiguous. Social management with multiple individuals living together is both possible and beneficial in many circumstances, and many AZA facilities do exactly that - because they know what they are doing.
No it doesn't. Joe Exotic consistently failed to provide adequate husbandry to their animals on all fronts: diet, training, spatial use, sanitation, safety, veterinary care... the list unfortunately goes on. His enclosures were overcrowded and the animals were constantly stressed and volatile due to their living conditions. The fact that he and other roadside zoo owners do this is not an indictment of managing multiple tigers in the same space; it is an indictment of doing it incorrectly and irresponsibly.