For as long as I have been using it, installing VirtualBox from the .run file "for all distributions" first removes the old installation from /opt/VirtualBox and that has not changed. Moreover, it unconditionally uninstalls it, whether upgrading or downgrading, it runs the uninstaller.
What the advice is probably trying to cover is VirtualBox installed from another source. You wouldn't want to have, say, a clever distro package (or their rpms or debs) installed then use their .run file to install the official binaries to /opt.
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