Base + bonus + annual refresher should be in the 700s annually. Likely the way this gets to $1M is with stocks going up and stacked refreshers (getting a couple annual refreshers while the initial grant is still vesting).
They should be reporting offer letters that get verified by Levels admins
So its $1,000,000
So its likely heavily factoring in stock price appreciation as the RSUs vest and have a portion withheld for taxes based on current value.