Thus it is 1309/335 = 4:1 in our advantage.

As long as the reader accepts that the Soviet Union never told a lie (cof, cof,
cof). As for the claims:losses total, nothing in what you posted breaks out US
from Allied losses, so this doesn't answer the question of how many _US_ losses
were caused by Soviets. Seems downright strange that in 3 out of 4 cases that
a Soviet pilot engaged an enemy, he shot it down - thats a level of military
effectiveness that requires the reader to believe that Soviet pilots swept the
skies of Sabres. That didn't happen.

Authors of books depend on accuracy by both the pilots and the report-writers
that came before them, and since every AF in history overclaimed, there is no
reason to believe the Soviet AF didn't - since they wouldn't cross the Yalu out
of fear that their participation would be discovered, its far-fetched to
believe that they could have been in a position to verify every one of the
claims. So its "Claims vs Losses", not "Shot down US aircraft vs Soviet
Losses". If your statistic is supposes to represent the former category, then
yeah, that's probably accurate - 4:1 in "claims" is probably right.