Quick questions: javelins with dueling style and natural weapon proficiency

[JNAProductions]

JC Tweets have been officially declared as unofficial house rule recommendations. They are not official until they appear in the Sage Advice Compendium.

But they do indicate the RAI.

You can claim they’re not RAW and be accurate.
But you can’t claim that the developers saying something doesn’t indicate RAI.

Moreover, you’ve yet to prove that your reading is the only possible correct one. It is a technically correct reading, but not the ONLY one.