Shoots of my Colaier Lii-500's innards. For comparison purposes.
I can see pairs of SK34 schottkies in series with each rail's current sensing R300 (0.3Ω) resistors. As far as my understanding goes this serves as reverse polarity protection with little burden effect. Thus, I guess GearBest's staff put their feet in the product's description. 
Cheers 