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I suggest to use ssh -X and forget about setting a DISPLAY variable or worry about xhost authentication methods.
You can use ssh also on a local machine instead of using the su command, for instance:
ssh -X oracle@localhost
If it does not work, make sure you do NOT have any DISPLAY variable set and have the xauth package installed, which is normally default. Why the Oracle database installation still points out an obsolete and insecure method to use X Windows for the purpose of running runInstaller under Linux, I don't know, since it wasn't really written more than 10 years ago, I guess.