Is Sirac human?

Pretty sure this dude is a simulation of some form. Either he is a human who is being simulated by Rebohoam, or is generated by Rebohoam itself, I'm inclined to say it's the latter.

Why doesn't Sirac meet with Hale in person, he redirects her car, only to do a VR meeting? That's a simulated person move.

Maeve meets with Sirac, but she's 100% being Incepted. I think her hubris at being more intelligent than humanity has her fooled into thinking the obvious fake reality was it, and she breaks out of it too easily. There are definitely levels to this forged reality. Besides, of you want to recruit someone, wouldn't you check to ensure they are loyal before releasing them into the real world. Maeve is just in a better level of test environment.

I also think Sirac doesn't have true self awareness, he just appears to be intelligent, but it's all a show. Rebohoam is attempting to collect data, to improve it's modelling of humanity, and Sirac is just a tool, appearing to have intelligence. Whether he is a simulation of a human who existed, or a completely computer generated being, he is not self aware.

Thematically I think it would fit, the mastermind/antagonist of the Season 3 is just a dark reflection of the hosts and/or the resurrection efforts of the park.