IIRC I wrote the part about there being two types of lists at the syntax level, which are bulleted and numbered, descriptive are effectively bulleted in the context of this behavior, but I think it is fine to say multiple.
With regard to the stated behavior about consecutive being parsed separately I don't remember writing that part unless as was suggested I mean that they were fully separate lists, but that wouldn't make sense. The behavior is that everything at a level is converted to the type of the first occurring list item at that level. One wrinkle is that when applied to individual list items org-element will report the type as written (which is expected) however on export they are converted to the type of the first occurring item. So the now-removed sentence might have referred to the org-element behavior. Regardless, the change is an improvement. Thanks! Tom