Gitlab is an interesting case: they publish their compensation formula, which yields different pay for the same work depending on the employee's geographic location.

Non for profit salaries are public, they aren't paying top salaries usually.

I also don't think this is what was meant.

In the US non-profits have to disclose this because the law says so and generally the non-profits do so in the most minimal discrete way possible. Few people, rarely recruiters, know where to go to get the information. This is even a service some background check companies provide.

I think the comment was referring to companies that celebrate the high wages they pay as a way to attract the best talent.