Looking at the document history,
It doesn’t look like significant changes have been made since last year,
The last time I personally reviewed it (nearly a year and a half ago), it was impression that the instructions on the Oracle Java website were sufficient to work… so the above SDB wasn’t even all that necessary.
Oracle has a habit of changing how its release works from time to time…
Recommend you try following the SDB and if you have any issues or questions you can’t work out, post.
You’ll notice that the SDB is written by someone not that familiar with openSUSE and as written you’ll be executing sudo plenty of times instead of simply executing the commands in an elevated console.
Some highlights from memory…
You’ll need to decide whether to install the JRE or JDK, I’ve found that the JRE isn’t usually sufficient because the openJDK equivalent is usually enough to run anything. The JDK may be needed because the extended functions from Oracle are more often a bit different than what you’ll find in openjdk-devel.
As usual, you can install either an RPM or a TAR. The RPM has been easier to install.
Until very recently (by release, not date), the Oracle install replaced whatever Java was on the system, recent releases support side by side installs using alternatives.
If any of the above is unclear,
Best if you ask beforehand… particularly if you don’t actually know whether you need to install Oracle Jave.
Most common use of Java is supported by openjdk from your openSUSE repo.