I am not sure who are these engineers that Ammon talked to... but nowadays what most engineers I know do is visiting Glassdoor or Blind. There you can anonymously and openly discuss salaries, their opinions about companies, business units, teams, and even discuss interviews.
If a company has a bad interview experience, a bad culture, or the management is impopular, if the work life balance is bad, or anything... you'll be able to read about that in those websites.
For example, a recruiter contacted me last year regarding an opportunity for a fancy senior role at a large company (Sr Staff engineer)... I checked the Glassdoor reviews for that company and found many testimonies from people who were contacted with the exact same narrative, but at the end of the interview process they were offered vastly lower levels, so clearly that was their intention all along. Because of that, I assessed that interviewing there was going to be a waste of my time and I ghosted the recruiter. Developers win.
Of course, you need to take some reviews with a grain of salt, but if everyone is saying the same thing, you will at least have a sample of what you are getting into.
Having said this, I am not sure Triplebyte will ever be able to effectively solve or mitigate the problems Ammon is describing. It is possible that he needs to continue talking to developers, and I am not trying to say this in a rude way. There are also many more problems that need help fixing that Ammon did not describe.
Having a conversation with a developer about different topics can give you some insights on the breadth and depth of the knowledge of a developer, and many interviews omit this. I think interviews should be "adaptive" tests, that get as progressively more difficult until you reach your limit.