An extension of the permit for these two Mystic whales is routine and arbitrary. In theory they could revisit the breeding ban as part of a new permit but would seem entirely unlikely they'd be exported back to Canada. At the time, I would have presumed those five to be the last import of belugas given the breeding restrictions, the three subsequent casualties, and NOAAs inquiry after the deaths. But these are different times now, so it could be entirely possible permits are filed to import or, given the absolute upheaval occuring at NOAA, a permit is submitted but simply not acted on by the Agency.
As for any Asia import - Canada would have to issue an export permit. Given their cetacean welfare law that was enacted, I believe there are considerations they'd have to make on suitable locations before granting a permit for that too. The burden would be on the receiving facility to prove it meets Canadian animal welfare standards which is probably a difficult task for many marine parks in China at least.
Of course there are sanctuaries that in theory could take them - Iceland and Nova Scotia, but the former continues to have difficulties and the latter isn't operational yet.
They really are kinda stuck in this limbo unfortunately.
