No. The domain published using the Root Domain option should be used only for Feature.fm links. If you would like to use the same domain from your website or merch store to be also used on Feature.fm, you will want to create a subdomain first that will be dedicated to any Feature.fm links you create.
For example, if your website URL is https://www.artistname.com and you want to keep that as your website’s location, create something like “music.artistname.com” on your domain registrar and submit that as a subdomain on Feature.fm. Once successfully published, your Smart Links will have a URL structure that will look like this: https://music.artistname.com/music-release-123