It is obviously true, there are just so many caveats. Generally true though. Caveats:
A player could struggle or at least "not destroy" a level because of some kind of injury or other problem that we aren't aware of;
Some players do get stuck in flawed mechanics or approaches, and that could send the wrong signal
I mean Aaron Judge had a .777 OPS at 23 in his first taste of AA and AAA, with 144 Ks in 124 games. So he decidedly did NOT destroy but that obviously did NOT put a ceiling on him. That's not the low minors but there are similar examples. Bobby Witt had a 83 wRC+ in rookie ball at 19. Ceiling on Witt?
That being said I do agree! If you are hunting for superstars, you want that small sample size signal of destroying the low minors as an 18 year old, or whatever. That's a common signal that most true superstars would share. Most, not all.