Not necessarily, at least on the first point. Someone could be getting coached.
A few years ago, a coworker of mine hired a contractor onto his team and was convinced the person who actually showed up was not the person who he interviewed (over the phone). He also thought the guy who did show up was getting a lot of help day-to-day from somewhere. The guy was a contractor, so it wasn't a huge problem because we could drop him quickly, but I would have never expected someone would do anything like that. However, it kind of makes sense as a scam: be a decent developer, get a stable of unhirable incompetents, and rotate them through companies while taking a cut of their salary.
The only way to prevent those kind of scams is to put all employees in probation for the first months of work and fire them if they don't perform, like it's common in the UK.
> designing a human process around pathological cases leads to processes that are themselves pathological
Eventually he got caught trying to manage all this
Some of us believe instead on the advantage of being a polymath, (also) to be able to export wisdom from other contexts into the current work.
Also in terms of the proper ground to facilitate innovation.
"Jack Ma says his employees should work 12 hours a day, 6 days a week" https://twitter.com/i/events/1116787491707731968?lang=en
Possibility which, by the way, makes the interviewer's cautionary move generally useless.
I assumed that keeping looking in the direction of the camera was relevant (in their idea).
1. https://www.amazon.com/glasses-eyes-them/s?k=glasses+with+ey...
It's what you would do anyway, unless you suppose that the interviewee would ever install dubious software on his core machine.