No, all you have to do to commit this fallacy is to declare something true based on someone's or something's authority. I don't care how you dress it up, it's a fallacy. A claim is true or false whether anyone agrees or not. I don't care who they are or how much you think they know. Nothing is ever true because someone says so. Saying it does not make it so.
The exception to this, of course, is God, who's authoritative spoken word is creative and efficacious.
It's why the appeal to authority, even when done correctly, proves very little.
It never ever proves anything, Nihilo. It just doesn't.
It mainly proves that the recognized authorities within a given field of study almost uniformly believes and teaches the same thing wrt a given point. And that is what I base my position upon; that almost the entire field of credentialed and professional cosmologists all agree on SM/GR.
You can decide what you want but it doesn't prove anything!
Surely, you understand the difference.
And as I mentioned, since I believe the earth and the heavens were created within the past 10,000 years, with the appearance of age, cosmological inquiry doesn't influence my theology in the slightest bit. All cosmologists are explaining to me, is how old the universe appears to be, and why.
Okay fine, but don't complain when they accuse you of holding to an unfalsifiable worldview because you do. There's nothing immoral about that. Just understand that this is the path you've chosen and realize that it is not scientific, it is not provable and that your study of cosmology is at best a time killing hobby of little more value than playing Sudoku on your iPhone.
When cosmologists ponder the facts revealed by the Hubble Ultra-Deep Field,
1 and say that they are looking 13 billion years into the past, I rather conclude that each grain of celestial sand wandering around the smallest of these 10,000 galaxies each plays its part in the continuing existence of the earth, and its inhabitants, humans being chief among all of them. The lengths to which the Maker has gone to give us what we have today is immeasurable and glorious. And whether He manages things through what the SM and DR express or not, doesn't change my view that everything is under 10,000 years old.
1 -
https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field
Calculating the distances to celestial objects happens to be one good place to look at the standard model with a critical eye.
The following short video will give you a taste of the sort of things that you don't know about the assumptions that the Standard Model and, more specifically, the Big Bang Theory make.