possibly. There's just... too much else to overcome if the turn coat bit is not a ruse. if the Tech they have is accurate, they don't need security codes to get to earth (they shut down the Orvile in orbit before they scanned it, they could do the same to any other ship or station they passed by).
and if they really ARE that powerful, then there's nothing that can be done to stop them, short of Issac somehow choosing to destroy all of Kaylon in a double super secret probation turn coat move.
Too much of it doesn't make sense. Mass graves under every city with easy access tunnels. Even if there had been a genocide, they'd have ground them to dust, and used all the subterranean space to build more data centers and power sources. Then dug even deeper and built more. Plus the only way the rest of the galaxy would pose a threat to the Kaylon would be if the whole galaxy united against them; smoking one of the main worlds in the union would do just that.
They've set too much UP to make it possible that it's a simulation. They've established that it's possible to pull memories from a person so convincing, that they wouldn't tell a simulation of their own parents apart from fiction (the zoo episode), and they've shown that Issac (and by extension, any/all Kaylons) are capable of creating a simulated world, where humans and other creatures act and react correctly in a way to fool the target (he's the one that set up the "Face your fears" simulation for the original security officer).
It all smells wrong. And while the Orville has been GREAT at skipping over unnecessary exposition, whenever it's smelled wrong, it's been shown there was a reason for it.
I'm pointing at the "shut down and scan" in space as the shift from real to simulation.