> Having said that, talking to a relative, I found out that this style of "interviewing" is often done when they already have someone for the position, but need to show (for compliance reasons, or otherwise) that they tried finding candidates, and only their preferred one qualified.

Or they only want candidates from a specific country to apply which is seemingly the case. I've heard from very talented and capable developers that they're getting auto-rejected once the interview reaches someone from a very specific country, no matter how good they did prior. I've also been personally told by people I know wouldn't BS me, that had my name sounded like I was from a particular country HR would have contacted me for an interview, but because I'm none of the countries some companies seem to only hire from, I get ignored. There's a problem with tech hiring and nobody wants to talk about it because most people are unaware.