Sparkling gouramis are not line bred, as such they should not be more of a risk then any other fish per se. Where the problem arises, is that the stock tends to be kept in the same systems as the linebred examples so is at greater risk of exposure/infection.
This is the same for any fish that comes through any of the somewhat grotesque mass production breeders/shippers. What elevates the risk specially for gouramis, is that they all tend to be kept in the same system. Cyprinids for example, would often be kept in another part of the facility.
An intense, dirty facility can concentrate infections. Inbred stock tends to be poor quality and immunodeficient - ripe conditions for epidemics.