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> the vulnerable feature is not in log4j < 2.10

The comment you cited is referring to the option to disable the vulnerable feature, not the vulnerable feature itself.

Per https://github.com/apache/logging-log4j2/pull/608#issuecomme... even log4j 1.x is vulnerable.

Does that mean it's only vulnerable if JMSAppender is used otherwise not? Which should at least be a rarer use case.

Log4J 1 is only vulnerable for JMS Log4J 2 is vulnerable < 2.15.0. There are mitigations for > 2.10.0 and > 2.7.0

What I understood from that comment is that log4j 1.x is only vulnerable if you use the JMS Appender, which is probably not the most common configuration.

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