I don't think the article outright claims Oracle has no JavaScript runtime, only that Oracle JET is no runtime, which is true. And since this is the evidence Oracle presented to keep the trademark, it's fair to point out that this is nonsense. But it's also true that if this goes to court, Oracle could present GraalJS (which is used in OracleDB) as evidence for their case.

There is also the nashorn JavaScript engine and graaljs.