I believe, yes, he means two different posts. Busy you have to post from busy.org and add the @busy tag, so I would assume you would do these for posts which are not contributing to the open source community, like a blog about photography for example. For open source contributions, you would post to Utopian separately I believe.

As for using Utopian as a non-techy, you still could most likely. I was looking into it thanks to this post, and it seems you would be able to post suggestions (have any suggestions/constructive criticism about Steem/Dtube/Busy/Utopian/etc that you want to bring it? You can post it there if it meets their guidelines) or tutorials (for example, you could do a Dtube physics tutorial series and post to Utopian under their Tutorial section I believe)