abodude, they're talking about Coffee Cup's SDrive hosting*, which includes a "Stream" with each site. The Stream can be used for blogging. You can include photos and videos as well as text.
So, you can create your Stream/blog on SDrive, but you can 'pull' it into a site hosted anywhere, the site itself doesn't have to be on SDrive. I have my Stream embedded in my non-SDrive site here: https://www.callendales.com/blog.html
To add/edit posts, I log into my Coffee Cup account, those changes instantly show up on the Stream within my site.
If I ever change my site, I can move or re-insert the Stream code anywhere I want it to show up.

(*Unlike traditional hosting, which requires FTP, SDrive is accessable with a username and password. The most-used Coffee Cup products also connect to SDrive for quick, easy uploading.)