I didn't say that __slots__ makes JIT possible. However, it does make writing one easier. (Also makes writing a faster one easier.)

EDIT: Is it the new modus operandi on HN: If a statement isn't seemingly 100% in support of your pet language, automatically read the statement in the dimmest and narrowest way possible?

Just think of it as there was some confusion and possible ambiguity, and your clarification has cleared it up for anyone interested in the subject but not yet knowledgeable enough. Someone can skim through and have their mental model corrected slightly now - a very nice thing!