I’m not familiar with tree and shrub depot so I don’t know.
I would say that most nurseries get their fruit trees from the same group of regional growers for the area. Bare root trees usually get handled by the retail nursery for a short period of time after receipt from the grower before dormant shipping.
Fruit trees in soil (potted) may be at the retail nursery for the whole season or be sold the next year, so perhaps they can tell better what they are selling, though if it doesn’t fruit there they may still miss on the variety.