Earlier quoted context omitted.
At Facebook, Google, and Snap, at least, the RSUs start vesting immediately (no cliff) and are as good as cash as the stock is liquid. It's not very clear what your distinction is.
Even if liquid, these salaries probably reflect people vesting stock from years ago - and the high end would include people vesting stock offered at a much lower valuation. In this kind of ranking there’d be a bias towards companies with rapidly growing share prices ... and remember that last performance is no indicator of future returns.
In other words: it does not take into account stock appreciation.
I don't know whether or not that's generally true, but from where I sit, the numbers seem sound and are not inflated due to a rising stock market.