It's difficult to establish trust or a healthy relationship with an emotionally withdrawn cyborg.

Ironically, a client who behaved this way would likely be hit with a personality disorder diagnosis.

When a therapist displays alarming or disturbing traits, it's assumed to be a technique or device.

If it is indeed deliberate, that is concerning. If it's not deliberate, that is also concerning.

Also, if you don't know enough about the person to gauge whether they are really like this, that's a red flag also, in my view.