It's not arrogance, just heaps of confirmation bias and mistaking a large amount of luck for skill.

I don’t think it’s arrogant, just realistic - if you aren’t interested in leaving your current job you probably aren’t going to no matter what the company trying to poach you does. So for them bend over backwards to convince you to interview is a waste of time.

That’s a huge false assumption, of course you might consider leaving if the interview process was less demanding and impractical? It doesn’t seem realistic at all. The company is just continuing with their bad interview process with their head in the sand, telling themselves “it’s okay, the people who don’t like our interview process probably aren’t any good or wouldn’t move anyway!”. I mean how would they know.