SuadeI get why you are confused.
Thermaltake has two keyboards with the same brand name, 'Poseidon'.
One is this 'Poseidon Cherry MX Blue' which has the original Cherry MX Blue switches and other is 'Poseidon Z Blue Switch' which has the Tt eSPORTS certified switches(Kailh switches).
foulmouthedruffianThermaltake made 2 versions of the keyboard initially. The first was the Cherry MX switches then they made a cheaper version later with the Kailh. I think both are still available so this is legitimate.