> If she was in his house and was a real Chinese spy who knows what data she extracted.
Not sure, if I follow. Are you saying that he has confidential papers just lying around his house? Or a computer (or other device) with confidential data without a strong password and an encrypted drive?
If any of this is true, I would say that this is actually a bigger problem, than the whole affair thing.
I'm just a humble software engineer and wouldn't let myself to handle any work related data so carelessly. Not sure, why a CEO of a huge multinational corporation would be held to lower standards.
Advanced security technology does nothing against the old attacks of "look over the person's shoulder while working in bed" and "your work is really interesting and important, please tell me more".
Hardware keyloggers, microphones, spycams, etc.
The precautions you describe does not shield against any of those, and I'm not even being creative.