Perhaps considering making your own arguments instead of just regurgitating whatever generative AI spits out?
Note that the AI has changed its response to not actually indicate that Gaijin has said that SB ratings are tied to RB performance. Also note that frags, assists, captures, etc all still happen in Air SB. Those are not metrics that are exclusive to Air RB.
All of these factors have direct impacts on what a planes average performance in Air SB is.
The fact that the battle ratings in sim are entirely different? There are planes in Air Sim that are at dramatically lower battle rating than their RB counterparts. Consider the following; in the most recent battle rating update the LF IX Spitfire was moved to 6.0 battle rating. The exact same plane is at 5.0 battle rating in sim.