I'm gonna go ahead and say you're talking out your ass to try to sound like you know sooooo much about skiing/racing... (and i'm making the assumption that 100kph = 60mph)
not only have I been clocked in at over 60mph on skis, I did it on park skis, 184 ace of spades on a center mount. Some joey had a radar gun and I asked him to see how fast I could go. I stripped out of my baggy park gear and in a full race tuck hit 63mph. Oh, and the next run, 49mph switch. that was fucking nuts...
Yeah, it's fucking ludicrous speed, but it's not unattainable.