They sell clones. Don't recommend buying anything from Aliexpress, they are also not on the list of dealers on krikzz's site (unless you mean that OP sd2snes is a clone and you can get the clone there for a much cheaper price).
I had this exact discussion with someone the other day.
SD2SNES is not a krikzz design. The schematics are open source and anyone can make one. The risk in buying a random Chinese SD2SNES is in the quality control. It's probably the same specs, unlike Everdrive where the Chinese knockoffs are probably not the same design at all.