Is my 2009 iMac fully erased?

I have followed the steps in What to do before you sell, give away, or trade in your Mac - Apple Support.

The hard drive is erased. Do I need to also get rid of Disk Images? See screenshot below. I want to be absolutely sure it's ready for donation. Thanks for your advice and I'm sorry if this is a stupid question. It has been a great workhorse for me and I am enjoying my new iMac27.