In other words, you never bothered to examine the claim made by the Russian propaganda machine that a Su-25 can shoot down an airliner at 35,000 feet (or whatever it was), when it was roundly discredited by aviation experts.
I’m not very familiar with the SU25 theory.
It doesn’t seem to have credibility.
But I noticed a logical flaw in the reasons you gave for why it couldn’t shoot down a passenger plane.