Why do you say that? It's not impossible, particularly for someone who already plays ice hockey or figure skates, to learn to carve within an hour of first putting on skis. Technique probably won't be very good, but certainly a useful practical level of skill is achievable. When I learned I found the movement very natural, the main adjustments were around getting used to gravity, uneven terrain, and the speed. I don't think too many beginners would have the balls to try going at 45 mph (I still feel uncomfortable above 40 mph), but it seems quite plausible to me that a reckless adrenaline junkie would do so.
I agree that somebody who is an accomplished skater could learn the skiing basics -- and maybe something approximating a carved turn -- quite quickly. I also agree an adrenaline junky with a long straight pitch and some reckless disregard for safety could also probably get up to 45mph.
That's a long, long ways from being able to execute something approximating a "carved turn" at speeds of 45mph. And I generally use a fairly loose definition of the word "carved"... but skis sliding sideways through the transition because you lack the skills to get any edge grip at those speeds is not what I call "carving" (at least that's what I'm visualizing from a "third day" skier).