ThermalM16As one of the massdrop staff noted earlier, the Z series is different from the non-Z series.
Non-Z (which is the kind being dropped here) uses Cherry switches. The Z series (the one you provided a link to on Amazon) uses some unknown imitation brand switch.
ThermalM16It's already been noted many times before. Poseidon and Poseidon Z are not the same SKU. Poseidon Z is not Cherry MX Blues. And as far as anyone is concerned Poseidon is pretty much out of production so you will most likely not find any Poseidon boards for sale on e-commerce sites.