Yes, but the ninth amendment does not add any right. It is merely a rule of construction.
What's the practical consequence of that valid point you're making, though?
Either you have all these unenumerated rights anyways, and the 9th just spells it out again so that every authoritarian gets the message,
or you have them thanks to the 9th and wouldn't have them otherwise.
Either way you end up with these rights, right?
(Let's leave the question of what rights we might be talking about out of the discussion here...)