That is what I said - I think this is the same quick re-target algo that is used by other coins
and is causing large jumps in the diff, as well as an average twice as long block finding time as designed
(because the jump *up* in diff causes a *much* longer block find time than is compensated by a subsequent lower diff)
For example, first the diff goes 3 times too high, so block find time goes from 8 to 24 min.
Then, block find time goes 3 times too low, avg block find time goes from 8 to under 3 mins.
Total is now 27 min instead of 2 x 8 min. Looking at the pool stats or the debug info from the wallet, you see that
block find time can be 2 times longer than designed - also leading to 1/2 payout and more frustrated miners on smaller pools,
since the block time is already high, now it is even higher due to the diff jumps.
I have proposed an alternative algo for diff re-target that does not have KGW vulnerability, but still re-targets quickly.
https://bitcointalk.org/index.php?topic=505243.msg5794484#msg5794484