Really, the French/uvular 'r'? Never noticed... If you have a vid, I'd really like to see it, quite curious ;)
To roll one's "r's" as the French do was once considered an aristocratic preserve, so-called grasejowanie
. Watch the video making fun of this pronunciation, particularly Ludwik Sempoliński's (starozakonny książe) part faking that mania: żądam satysfacji z bRonią w Ręku...
Watch from 7:00 time stamp: