That's what is reported to the NSAC. UFC pay that figure to them, they hold it 30 days then pay the fighters after tests and stuff are passedMost reports so far are all around 500k for the fight.
Then add fight week incentive pay (30k?) & performance of the night bonus (50k). Possibly a win bonus.
The UFC can (and do) pay fighters outside of these disclosed sums and pay it the day of the fight so fighters get money straight away. Any decent manager will have this organised.
Listen to any fighter, what is disclosed is not only what's paid