True enough. This old printer is out the door! Clicking the minus sign will uninstall the old software? Or is that unimportant to UNINSTALL it?
No the siftware willstay as that is an Apple/Mac thing. Right now I have many hundreds of Printer drivers (Files) on my Mac that I never put there. They are loaded by Apple so you can install all those printers when and if you need to.
Don't run the software that came with the printer, unless instructed to. Just select the printer model from the list of printer that comes up when adding a New Printer. If it is not listed then you may need to update the printer list from Apple. Sorry it's been awhile since I installed a printer on my Mac, or any computer. The ones I originally setup still work.