You seem to have a total misunderstanding about the threats this person faces.
If your job is running seminars about IT security to random companies, taking the projector with you to the bathroom is ridiculous and your clients will think you're a tin foil hat weirdo to boot.
Of course, if you're Snowden or Assange, your threat landscape is quite different and this would not be paranoid at all.
No, he doesn't connect anything, that's why he has his own projector and cables. And if he did, most companies would be much more concerned about the risk they present to company networks.
If your job is running seminars about IT security to random companies, taking the projector with you to the bathroom is ridiculous and your clients will think you're a tin foil hat weirdo to boot.
Of course, if you're Snowden or Assange, your threat landscape is quite different and this would not be paranoid at all.