Has t3-assets folder any impact on Stackideas products if I delete it?

I have removed the T3 Frameworks and JA Mitius template from my site but noticed there is a folder called t3-assets still in file manager.

There are 2 sub folders, css and dev.

The dev sub folder relates to t3 and Ja Mitius less files but the css folder has loads of files in it with references to Stackideas products I have on the site.

I assume they relate to when I was using your products on the JA Mitius template but just wanted to be sure before I deleted the t3-assets folder with css and dev sub folders.