Is this package still being developed?

[TernaryM01]

[My SageMath is version 9.7, installed using conda.]

I opened demo_sage_explorer.ipynb. Upon executing the first cell:
from sage_explorer import explore
It gives me ModuleNotFoundError, ipyevents is missing. So I installed it:
mamba install ipyevents -c conda-forge

I ran the cell again, and now it gives me:
DeprecationWarning: the complex_field module is deprecated, please use sage.rings.complex_mpfr
which is weird, showing that it is out of sync with another sagemath package.

But I moved on to the second cell:
p = Partition([3,3,2,1])
explore(p)
Now it gives me:
AttributeError: 'HelpButton' object has no attribute 'set_tooltip'
from the following line in sage_explorer.py:
self.children[1].set_tooltip(self._tooltip)

Clearly this package is no longer being maintained, and has been rendered unusable. So, why is it still included in SageMath?
If it has been abandoned, running the first cell should simply tell me "sage_explorer is missing."