This is true, but only for the initial domain of your account (and domains parked on it). But it looks like you removed the subdomain from your account, and then added it again. By doing so, the domain got assigned to a different directory: bluewinds.rf.gd/htdocs.
It looks like you removed that directory. But that’s the directory the server looks for, and if it can’t find that directory, you’ll get a 404 error.
So please recreate the bluewinds.rf.gd/htdocs/ folders and move your website files to it.