They're not. You cliterally just quoted where they're officially decreed as not. You can't get any clearer than that.
I consider them to be a perspective to look at. My rulings take precedence at my table, and I'm free to ignore Jeremy's perspective.
Other.
"official rulings" is the kind of phrase that should be expunged from our vocabulary. The only ruling that matters to my game is my table's.
I don't care what he's tweeting.