It doesn't say they are paying him more, just that they are structuring things in a way he can sell stock but keep his control. A relevant excerpt from Meta's investor update (bold mine):

Meta intends to file an amended and restated certificate of incorporation in Delaware to establish the Class C [non-voting] common stock, with an effective date of January 19, 2027. The Board has also declared a one-time stock dividend of one share of Class C common stock for each outstanding share of Class A common stock and Class B common stock, contingent upon, and to be paid after, the effectiveness of the amended and restated certificate of incorporation.

If I understand correctly, each existing share is effectively split into a voting share and a non-voting share (which the market will price, probably each at around half the original value). Google did this in 2014, and GOOGL (voting) shares are worth about 2% more than GOOG (non-voting) shares.