Quick questions: javelins with dueling style and natural weapon proficiency

[stoutstien]

You can use the JC Tweet if that meets your standard. The tweets however do not meet the official standard

JC Tweets have been officially declared as unofficial house rules. The official FAQ is the contents of the current Sage Advice Compendium. The JC Tweet is not in the current Sage Advice Compendium.

What in the world is official standard?