Hive has definitely de-coupled from Steem. If you go back to March/April 2021, they both rose in tandum, along with lots of other alts.
This time Hive is pumping, but Steem is not, so whatever is happening is Hive specific. (If it was the Koreans behind the pump, Steem would be pumping too, as there are a lot of Koreans on Steemit).