I am assuming that you have built and currently maintain your website using Dreamweaver and have a working knowledge of HTML and CSS. As indicated in the links you’ve provided, Dreamweaver can certainly be conneced to WordPress to create and edit a theme with a local server environment then pushed to your web host via FTP. However, you cannot edit the page or post content with Dreamweaver as the content HTML is stored in a database and not in an HTML file.
WordPress is a CMS, which requires a different approach and workflow (from a static website) when maintaining and updating your content. Your theme and template files are PHP with HTML for structure/layout and once in place would rarely be edited or changed. These files do not contain any content, just the instructions for getting the content from the database and displaying it within the intended layout.
Creating a WordPress version of your website would require some planning, however, is worth the effort as it will be much easier to maintain. I’m afraid you’re going to have to give up the idea of using Dreamweaver for content management. It is not a matter of it not being a good tool for editing code, you should use what you are comfortable with. It is simply not possible to edit HTML within a database using Deamweaver. WordPress has its own editor for this purpose with a Visual & HTML mode. The editor’s visual mode can also be truly WYSIWYG with an additional CSS file in your theme and can be extended with a plugin.