Hi. As you probably know, licensing for ArcGIS Pro/ArcGIS Enterprise is composed of four elements. 1) the user identity, 2) the Pro license (basic, standard, advanced), 3) the capabilities (view, editor, creator) and 4) any extensions (such as the Utility Network).
The basic license for ArcGIS Pro is exactly what it says, it is a basic configuration that lets you have basic map components and elements but is very limited on advanced capabilities (such as the UN tools exposed in the Ribbon or GP toolbox). For more details regarding the ArcGIS Pro licensing levels, I recommend this documentation. The ArcGIS Utility Network Extension provides access to the functionality on the server side but has no ability to provide capability that is driven by licensing on the ArcGIS Pro side. So you might ask, why did you include it in that statement, well, if someone were to write an add-in for UN-type capability it could work along the lines of a viewer role; we don't constrain that behavior, but we don't provide the tools to enable it. ArcGIS Pro at the Basic level does not allow editing in a multiuser environment, so it is not available for editing. If you have more questions about your licensing, I strongly recommend reaching out to your sales manager for more details and I apologize for the confusion in the blog.