Well, maybe. Or it shows that they hired people who were relatively comp insensitive, possibly due to being unable to command higher wages elsewhere. Hard to know.
The first comment said that the culture is so good that devs don't leave even with capped salary. The next comment said (politely) that maybe they don't leave because they are for some reason unable to command top-tier salaries.
They were saying this specific company might have a biased group of devs who are abnormally insensitive to salary, thereby removing its value for a generalized conclusion.