OK, I’ll be serious. To answer your question without the well painted set-up:
"My question is: reading a route correctly, without any fall at a first time, is it a beginer or a advance climber skill?”
Beginner’s suck at reading routes. They constantly try to find a better hand-hold when we all know climbing is with the feet. As we progress to “intermediates” we figure that out. We no longer think “where’s the next handhold”, rather “how do I get my foot on that?”... That is the first epiphany. The rest is just trying to figure out how to use our feet better and on small holds... how to conserve energy, rest when we should, go when we should... etc...
Your question, like many you pose here, is impossible to answer because you leave two black & white answers. Beginner or advanced? Most climbers, especially those who are most active in these forums, are in between... they are not sport or trad, they are not guide or recreational... they are climbers... and for them... “reading a route correctly” is not in their vocab... but improving one’s route finding abilities is a great part of climbing.