Obama's political organization has backing Biden's campaign and has had a major say running Biden's presidency.
Now he is trying to cover his tracks and disavow his involvement Both the Clintons and the Obamas (and probably more) are angling for a power grab of one form or another at the Democrat convention, but it will be done quietly behind the scenes to avoid disrupting the party.
That said, Biden is going to be very hard to dislodge. His team has been very clever setting the system up so that Biden will be all but impossible to remove.
The debate was timed perfectly for Biden. He cannot be removed and replaced in critical swing states and the debate occurred right before the summer break when Americans traditionally stop paying attention to politics. Congress will be on break in August so nothing will get done
About all he can do between election time is die in office
As the space alien said to the redneck in MIB1:
As you wish.......