So no, I dont' see hypocrisy here.
Its night and day. Trump's stewardship put these children in a lord of the flies scenario where they had to take care of each other and the leadership acting more like prison guards than caretakers.
I agree that Biden should close those things down but he cant just release the children into the wild. He got left with a timebomb and care has to be taken when dismantling it. Time will tell if he commits to transitioning these children to more appropriate living facilities and finding their parents (https://reason.com/2020/10/21/545-migrant-kids-snatched-by-t...) or relatives. He's been president less than 2 months. it will take time to see if he honors his commitments.