Yes, that's what was on paper, but that doesn't make it true. I interpreted the claim of "tests" as merely a facade. As I said, there was nothing behind the front lobby but the empty warehouse and the portal. And the guy led Kara and Mon-El back even though they'd made no prior appointment -- heck, they hadn't even filled out the applications.
Such details aside, I don't believe the writers have any intention of doing a metahuman/Dominator story here. Probably the reason they used the Dominator was because they spent a lot of money on the digital model and wanted to get more use out of it, and because they like their Easter eggs and continuity nods. It could've been any alien that came to buy the slaves and bowed at Mon-El, but it was convenient to put a Dominator into that role. I doubt there's any more to it than that.