Pretty much. But you're not seeing the important parts.
"Morality cannot technically exist."
"We have no more inherent values than an ant"
"And none of our lives will have mattered for anything."
We have no objective, technical, inherent, meaning or purpose.
What we do have, is a buttload of subjective meaning and purpose. It isn't that morality doesn't matter because we made it up. It is, in fact, very much the opposite. Morality, love, reason, laws, beauty, and purpose matter because we made them up. Because they mean something to us.
Soon we will all be dead and the sun will devour the earth, and our lives will not have mattered. That's precisely why our lives matter so much while we have them. Because they are all we have.
In comparison to the lifespan of the universe, my life will not even be a blink. In comparison to the lifespan of myself, of my own experience, my life will stretch from the beginning to the end.
There is an idea in aesthetics of the sublime vs the beautiful. The sublime is awe-inspiring, terrifying, and immense. It is objective and universal and infinite. The beautiful is brief, fragile, and temporary. It is subjective, and defined by its brevity.
Our lives are not devoid of meaning because in seven billion years all evidence our planet ever existed will be destroyed. Our lives are meaningful because of that. We are beautiful, not sublime.
That is what I believe, and I will continue to live every minute of my life as if it is true, because I don't have the time to waste.