This is for extended support for Java SE8 only. Public updates are still available for SE9 and later releases. Java SE is transitioning to a Ubuntu-like release system with YY.M releases, some of which will be LTS will longer public update lifecycles.
The article/topic is specific for Java SE 8 which is an old release and will have been an old release for several years when this goes into effect in 2020. Not uncommon to require commercial support for old releases, it encourages adoption of later versions (among being a bit of a blatant cash-grab).
It's not totally clear, but it doesn't seem like newer versions are or will be subject to this stipulation.
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