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8-10 YOE and new offers only means he was right around a cool $1M/yr

What does this mean out of interest? Like $250k salary and $750k stock?

managers seem to get much more money than their corresponding peers on the software track according to this website.

they're rarer & in higher demand, therefore

Not at FB at least, E6 ($568K) is M1 equivalent ($584K).

Senior engineer III on levels.fyi is approximately even with a team manager TC-wise, but above that they seem to diverge rapidly.

You missed the preceding "for my years of experience" statement.