I think they're saying that it's not a very appealing place to work if you can get $500k or higher offer from the Googles and Facebooks of the world.
None of this applies to Basecamp, and as much as I'm a fan of Rails I've spent a lot of time in that source and am not of the mind that a top Rails hacker is doing work nearly as difficult as the more sr. staff at a FAANG.
They are the outliers.