The body and switches look exactly like an x-arcade stick.
The shaft is different. The x-arcade one is the same diameter all the way up and relies on the shaft cover to hold it up whereas this one steps in diameter.
The handle looks to be the same shape though.
I have one laying around. I'll look for any markings when I get home.
EDIT: The switches on the x-arcade are two-tone like the ones in this pic on the page you linked to.

IIRC, the actuator looks different.