Universal did quite a bit of shuffling around with their expansion projects because of COVID. A lot of their creative resources either got laid off or moved over to Epic Universe and now that we're out of COVID some of those people who got laid off are back and are being placed on shelved projects or brand new ones.
I believe the original idea pre-COVID was to have some additional infrastructure and Volcano Bay pt. 2 open to the public before Epic Universe's original planned opening.