My guess is because unknown "someones" assisted him in "winning" in 2018.
I think the price for that victory was Georgia's 2020 electoral votes and the 2 US Senate seats.
Kemp is a Never-Trumper who did a dirty deal with Dominion (along with Raffesperger). The deal was that they get to keep their cushy state jobs as long as the two Senate seats went to the Dems.
Kemp is hated by the MAGA base, yet Dominion had him at a STEADY 75% when counting the primary votes from beginning to end.
Conservative voters cannot overcome the RINO scum paired with the getto Democrat cheat machine in GA.