Essentially yes. There is now only one download, Roon. No separate downloads for Roon Server and Roon Core. The only difference when running Roon on a single computer is that the server now runs automatically as part of Roon, but it remains a separate process on the computer, meaning that the user interface app can crash or quit and the music continues. While in the past, the server component normally ran as a part of Roon Core, so when the user interface crashed or quit, the server part stopped as well.
(In the past, you could already install Roon Server on the same computer as Roon Core, and then only use the user interface of Roon Core, while connecting to the separate Roon Server. It was always the better setup, but you had to do it manually. Now it happens automatically)
The release notes for the latest update go into more detail, in case you didn’t see them: