‘Current Cell’ is only a thing (and only makes any sense) for stuff inside RG cells. Not for stuff inside popups (popups don’t have cells, let alone current cells).
So you need to define what Thing it is you want to delete.
You can do it with a custom state, but the simplest way is just to set the Popup content Type to the type of the thing, then use Display Data to define what thing it is. Then the button in your popup can just Delete the Popup’s thing.
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