How to remove cached image from Adobe portfolio

My previous employer is requesting that I remove an image from this website https://cdn.myportfolio.com/

I have removed this image completely from my adobe portfolio webiste however for some reason the image is still being cached on the above website. I am very confused, how on earth did my ex-employer even find this website? It does not even work. They sent me a link to a webpage containing the image (not going to share it here).

How do I go about removing this image completely? What even is this website https://cdn.myportfolio.com/? I know it is linked to my adobe portfolio website somehow