Well, when you work at Google, at least you must have passed that kind of an interview at one point - which is something I'm fairly certain I wouldn't be able to do.
One of Google's HR groups did a test where they gave the hiring review team their own interview packets (anonymized, from when each team member originally interviewed). None of them were hired.
I can say with 100% certainty that my coworkers ask questions in interviews that they wouldn't be able to answer themselves. It's kind of ridiculous IMO and I try to call it out when I see it (in the nicest possible way of course)
The issue with impostor syndrome is that your brain is good at finding excuses such as "I was lucky", "They did not catch me", and so on.
Personally, I had a lot of fun doing my interviews and learnt a lot while preparing them. I would recommend you to try them, it's gonna be interesting, even if you don't get the job.
I have done interview training twice in my 8.5 years at Google, and both times it only made my impostor syndrome far far worse. I simply can't do interviews here, I wouldn't pass the ones I had to give.