Let me see if I got this update right.

With the bonus from cards I have I used to mine 1.2 sat per hour.
Now that has been replaced with Bitz which are pegged to US$ meaning 1.2 sat (where BTC is currently at about $50K) would be roughly 60 Bitz, but I'm now mining only 8 Bitz per hour.
Or in other words, even though @jamboon stated that the mining rate after the update should be about the same it was before, this update has cut mining payout by 84%.