I see what you mean.
If you wish to delete the undesired products, there is a solution.
Go to Products.
In the search area at the top, do a search using only one parameter: Select Category. Leave everything else blank. In the Select Category drop-down, choose the target Category and click the Go button.
(you may need to re-enable the disabled target Category before you do this?)
This will yield a list of only the products from the target category.
At the bottom of the displayed list, choose All to display all products in one long list.
Tick the top-most checkbox to put a check in the box of every product.
At the bottom right of the displayed list, click the Choose Action drop-down, choose "Delete selected".
That should delete all of them.
If you don't want to delete them, do some research and learn what the capabilities of the "Save selected" option are. Maybe you can save them all as "off"? I don't know, never tried it.
Last idea: ask the AC dev's to add 2 more options to that Choose Action drop-down menu: Turn On, & Turn Off.
Good luck!