As far as I have been able to ascertain so far, there has never been any legal issues involving certain American aircraft manufacturers and the designers of the IL2 series of games.
My assumption is that the whole 'legal problems' line was to buy time for 1C's sloppy management and poor customer relations in delivering the required patch/fix to bring PF up to speed. You can put it in the same file as the endless run of sick programmers, office relocations, dog ate my homework type arguments that 1C have been feeding people for 6 months now.