The PERM / H1B figures only show base salary and exclude RSUs which for most big tech companies is the larger factor at senior and above levels. Netflix pay all cash so their PERM figures are much more representative and match the levels.fyi numbers pretty well, giving me confidence that those self reported figures are broadly accurate.
(When comparing keep in mind Netflix hire only at senior software engineer level and above and have a single level title so staff/principal levels are collapsed to senior just with higher salaries.)
This is why a simplifying assumption was made with the 1:1 ratio of salary:RSUs. Obviously it matters when comparing two companies, but in this case the question was simply "who makes 600k" and the answer is 'probably nobody unless the stock did real gud'
The salary:stock ratio increases the higher Your level. 600k would likely be an L7 offer, though you could reach that at a lower level through stock appreciation.
(When comparing keep in mind Netflix hire only at senior software engineer level and above and have a single level title so staff/principal levels are collapsed to senior just with higher salaries.)